UNIVERSITY OF MARIBOR...Buildings of the Faculties of Engineering of the University of Maribor ence in the front (a view from the west side) Faculty of Electrical Engineering and Computer

UNIVERSITY OF MARIBOR

FACULTY OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE

ANNUAL REPORT RESEARCH ACTIVITIES 2001

MARIBOR, APRIL 2002

UNIVERSITY OF MARIBOR FACULTY OF ELECTRICAL ENGINEERING

AND COMPUTER SCIENCE Smetanova ulica 17, 2000 MARIBOR

SLOVENIA Phone: +386 2 220 70 00

Fax: +386 2 251 11 78 http://www.feri.uni-mb.si

ANNUAL REPORT Research activities 2001

Editor: Prof. Dr. Damjan Zazula

Copy edit: George Yeoman, MA

Text processing: Štefan Masič and Suzana Pušauer

Photos: Gerhard Angleitner, MSc

Cover design and typography: Dr. Miha Završnik and Repro studio OK, d.o.o., Maribor

ISSN 1408-6328

Published by: Faculty of Electrical Engineering and Computer Science,

Maribor

Print: Publishing and Printing Dept. of Technical Faculties of Maribor

Number of copies: 250

Year of publication: April 2002

CONTENTS

FOREWORD ................................................................................................... FW – 4

Study Programs, Options and Concentrations ...................................................... FW – 5

Student Research Grants ...................................................................................... FW – 14

Graduates of the Faculty of Electrical Engineering and Computer Science .......... FW – 15

Masters and PhD Degrees ..................................................................................... FW – 16

Research by Institutes and Laboratories ............................................................... FW – 21

Programme Units ................................................................................................... FW – 23

Overview of Projects and Staff by Research Units ................................................ FW – 36

INSTITUTE OF AUTOMATION ....................................................................... AU – 1

Systems and Control Laboratory ........................................................................... AU – 4

Signal Processing and Remote Control Laboratory ............................................... AU – 11

Process Automation Laboratory ............................................................................ AU – 18

Measurements Laboratory ..................................................................................... AU – 25

Electro–Optical and Sensor Systems Laboratory .................................................. AU – 32

INSTITUTE OF ELECTRONICS ..................................................................... EL – 1

Digital and Information Systems Laboratory .......................................................... EL – 4

Electronic Systems Laboratory .............................................................................. EL – 15

Microcomputer Systems Laboratory ...................................................................... EL – 19

Digital Signal Processing Laboratory ..................................................................... EL – 28

INSTITUTE OF POWER ENGINEERING ....................................................... PE – 1

Electrical Machines Laboratory .............................................................................. PE – 4

Power Engineering Laboratory ............................................................................. PE – 8

Electromechanical Systems Control Laboratory .................................................... PE – 24

Fundamentals and Theory of Electrotechnics Laboratory ..................................... PE – 32

Applied Electromagnetics Laboratory .................................................................... PE – 37

INSTITUTE OF ROBOTICS ............................................................................ RO – 1

Power Electronics Laboratory ................................................................................ RO – 4

Industrial Robotics Laboratory ............................................................................... RO – 7

Kinematics and Simulations Laboratory ................................................................. RO – 15

INSTITUTE OF MATHEMATICS AND PHYSICS ........................................... MP – 1

Applied Mathematics Laboratory ........................................................................... MP – 3

INSTITUTE OF COMPUTER SCIENCE ......................................................... CS – 1

Computer Graphics and Artificial Intelligence Laboratory ...................................... CS – 5

Computer Architecture and Languages Laboratory ............................................... CS – 7

System Design Laboratory ..................................................................................... CS – 13

System Software Laboratory .................................................................................. CS – 29

Heterogenous Computer Systems Laboratory ....................................................... CS – 39

Geometric Modelling and Multimedia Algorithms Laboratory ................................ CS – 45

INSTITUTE OF INFORMATICS ...................................................................... IN – 1

Information Systems Laboratory ............................................................................ IN – 4

Database Technologies Laboratory ....................................................................... IN – 22

Computer Mediated Communication Laboratory ................................................... IN – 34

Real–Time Systems Laboratory ............................................................................ IN – 40

Faculty of Electrical Engineering and Computer Science FW – 1

Photo: Gerhard Angleitner

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FW – 2 Faculty of Electrical Engineering and Computer Science

Faculty of Electrical Engineeringand Computer Science

Dean: Prof. Dr. Ivan Rozman

Institute of Automation

Head: Prof. Dr. Karel Jezernik

Institute of Computer Science

Head: Prof. Dr. Viljem Žumer

Institute of Electronics

Head: Prof. Dr. Bogomir Horvat

Institute of Informatics

Head: Prof. Dr. Ivan Rozman

Institute of Robotics


Institute of Telecommunications (under preparation)


Institute of Power

Engineering Head:

Prof. Dr. Ivan Zagradišnik

Institute of Mathematics and Physics

Head: Prof. Dr. France Brešar

until Oct. 31, 2001 Prof. Dr. Vitodrag Kumperščak

from Nov. 1, 2001


Prof. Dr. Ivan Rozman Dean

Assoc. Prof. Dr. Zmago Brezočnik

Deputy Dean of Education Prof. Dr. Damjan Zazula

Deputy Dean of Research


FOREWORD

One of the basic aims of the Faculty of Electrical Engineering and Computer Science in Maribor (FERI) is to become both a locally and internationally recognised scientifically creative organisation with quality educational courses. This is why efforts are primarily focused on producing new horizons in the fields of electrical engineering, computer science, information science, telecommunications, and media communications and then to transfer this knowledge to the Slovenian and International areas. In addition, fundamental research work at FERI has also initiated further applied projects that have led to many successful practical implementations.

This faculty's mission is carried out by individual institutes, whose duty it is to take care of complementary scientific disciplines. Our institutes are formulated according to the particular needs of certain educational processes both at university and higher professional levels of study. There are eight different institutes at the FERI: Institute of Automation, Institute of Electronics, Institute of Power Engineering, Institute of Telecommunications, Institute of Robotics, Institute of Mathematics and Physics, Institute of Computer Science, and Institute of Information Science. These institutes are further divided into laboratories, each being responsible for development and educational activities as a whole in their scientific fields. They also have complete financial autonomy. These laboratories totalling 28 take care of specialized domains within similar research and development activities. Their autonomy is only partial. Whilst institutes should be headed by full professors, the heads of laboratories can be more junior professors.

FERI ranks among the so-called research faculties, which is also evident from the structure of its income. The amount generated by research activities has for several years been as high as 40 % of total income. About 50 % of this amount comes in a so-called programme-project scheme from the Ministry of Education, Science and Sport of the Republic of Slovenia. The remaining 50 % is earned by international project collaboration, in particular by the European Fifth Framework, and also by work in applied and development projects for various contractors in Slovenia and abroad. Other bilateral international projects are quite numerous, although their financial effect is rather low. This is in accordance with the purpose of these projects being mainly a support for the contacts and mobility of researchers from different countries.

The management of FERI is convinced that the Faculty’s present scientific orientation has proven successful, therefore it will spare no effort to promote these lines of activities, especially in order to make FERI better known and distinguished within the European Union as well as in other countries of the world. Above all, it supports participation of the Faculty members in international project teams and in all kinds of successful collaboration with business partners.

Dean Prof. Dr. Ivan Rozman


STUDY PROGRAMS, OPTIONS AND CONCENTRATIONS

Undergraduate studies The Faculty of Electrical Engineering and Computer Science offers two separate types of study programs, each leading to a different type of degree: university and professional one. Three study programs with several options are offered towards the university degrees and two study programs towards professional degrees.

The university-degree study program in Electrical Engineering includes the following options:

• Automation with concentrations in: - Production Automation - Process Automation

• Electronics with concentrations in: - Industrial Electronics - Computer Electronics

• Power Engineering with concentrations in: - Electrical Power Engineering - Electric Controls - Electromagnetics

• Mechatronics with concentrations in: - Communications - Regulations - Instrumentation - Actuation - Embedded Systems - Programmable Tracking Systems

The option of Mechatronics is interdisciplinary, supported by the Faculty of Electrical Engineering and Computer Science and by the Faculty of Mechanical Engineering. Also the computer science students are eligible for this option after the first two years completed in computer science.

University-degree studies last nine semesters and include lectures, exercises, and practical placements in industry. The first two years are the same for all options.

The professional higher education program in Electrical Engineering comprises the following options:

• Automation with concentrations in:


- Process Automation - Robotics

• Electronics with concentrations in: - Industrial Electronics - Computer Electronics

• Power Engineering with concentrations in: - Electrical Power Engineering - Systems Technology - Structural Technology - Telecommunications

Professional higher education programs last six semesters consisting of lectures and exercises, and an additional semester of practical placements in industry. The first year of studies is common for all options.

Electrical engineering is also offered as a combined interdisciplinary university-degree study of electrical engineering with economics. It is organised by the Faculty of Electrical Engineering and Computer Science and by the Faculty of Business and Economics in Maribor. The duration of studies is eight semesters with about 2/3 major subjects given in electrical engineering and 1/3 major subjects in business and economics.

Graduates of electrical engineering with economics are qualified to proceed with their studies towards masters or PhD degrees either in electrical engineering or in business and economics.

The university-degree study program in Electrical Engineering with Economics includes the following options:

• Automation • Electronics • Power Engineering


Electrical Engineering Studies

University degree studies Studies to professional higher education degrees

PhD

3rd and 4th Year

Masters degree studies - Electrical Engineering

- Electronic Vacuum Technology

2nd Year

1st Year

University degree University degree

Undergraduate studies9 semesters

- Automation - Electronics - Power Engineering - Mechatronics

Matura Examination(an external examination)

Undergraduate studies6 semesters of studies and 1

semester of practice in industry - Automation - Electronics - Power Engineering - Telecommunications

Final examination(an internal examination)


The university-degree study program in Telecommunications consists of two years of study with common fundamental subjects and two additional years with a variety of electives. Therefore, the studies last eight semesters and include lectures, exercises, and practical placements in industry.

Telecommunications Studies

University degree studies

PhD

3rd and 4th Year

Masters degree studies

2nd Year

1st Year

University degree

Undergraduate studies 8 semesters

Matura Examination(an external examination)


The university-degree study program in Computer and Information Science includes the following options:

• Software with concentrations in: - Systems - Engineering Informatics

• Information Science with concentrations in: - Business Information Systems - Process Information Systems

University-degree studies last nine semesters and include lectures, exercises, and practical placements in industry. The first two years are the same for all options. After the first two years in computer science studies, students can continue in the mechatronics option within the electrical engineering program.

The professional higher education program in Computer and Information Science comprises the following options:

• Software • Information science • Logic and systems

Professional higher education programs last six semesters consisting of lectures and exercises and an additional semester of practical placements in industry. The first year of studies is common for all options.


Computer and Information Science Studies

University degree studies Studies to professional higher education degrees

PhD

3rd and 4th Year

Master degree studies - Computer and Information Science

2nd Year

1st Year

University degree Professional higher education degree

Undergraduate studies 9 semesters

- Software - Informatics Science

Matura Examination (an external examination)

Undergraduate studies 6 semesters of studies and 1 semester of

practice in industry - Logic and Systems - Software - Informatics Science

Final examination (an internal examination)


In 2001, a new university studies programme of Media Communications was accepted at the national level. The curriculum is going to be covered interdisciplinary and co-ordinated by the Faculty of Electrical Engineering and Computer Science of Maribor. The first year of studies begins in the academic year 2002/03. The students in senior years will be able to specialise in RTV Production and Interactive Graphic Communication, while the total duration of studies will be eight semesters. The title received after a successful completion with a diploma work will be a Media Communicologist with University Diploma.

Media Communications

University degree studies

PhD

3rd and 4th Year

Masters degree studies

2nd Year

1st Year

University degree

Undergraduate studies8 semesters

- RTV Production - Interactive Graphic Communication

Matura Examination (an external examination)


Graduate Studies

Graduate studies basically aim at the acquisition of in-depth theoretical and applied knowledge enabling the prospective graduate to carry out independent and creative research in various technical sciences.

Masters degree and PhD studies

In 2001, masters degree and doctoral studies were organised as shown in the two preceding diagrams.

Three graduate programs are currently being offered:

Electrical Engineering including the following options:

• Automation • Electronics • Power Engineering

Electronic Vacuum Technology

Computer and Information Science

For every graduate student entering the first year of studies, their supervisor selects the following:

• the courses that the student will attend and the exams the student will complete • a research project that will be individually assigned to and conducted by the student

The student must collect a minimum of 120 credits during the first two years. Out of this total, 75 credits must be awarded for the examinations, while 45 credits must be awarded for the reports completed on their individual research projects. For every passed exam and publicly presented report on individual research projects, the student is awarded 15 credits.

Terms for Progress

The terms of inscription to the postgraduate studies are specified by the Statute of the University of Maribor and by annual public calls. Other obligations of the students are depicted by labels 2 through 5 in the graphical presentation of university-degree studies.

2―Minimum of 30 credits.

3―The student must pass all the exams during the first two years and present the reports on their individual research work with a minimum average grade of 9 (out of 10).


According to the “Regulation of Habilitation Procedure for University Teachers, Scientific Workers and Co-workers” valid at the Faculty of Electrical Engineering and Computer Science, the student's bibliography must be awarded a minimum of 2 points, based on their scientific research activities. Additionally, a recommendation letter from the student's doctoral studies supervisor is requested.

4―According to the “Regulation of Habilitation Procedure for University Teachers, Scientific Workers and Co-workers” valid at the Faculty of Electrical Engineering and Computer Science, the student's bibliography must be awarded a minimum of 2 points, based on their scientific research activities.

5―During the third year of study, students must report on their research work at twice, and during the fourth year once a year. This totals in 45 credits. Additional 75 credits must be awarded for a successful presentation and defence of doctoral dissertation. According to the “Regulation of Habilitation Procedure for University Teachers, Scientific Workers and Co-workers” valid at the Faculty of Electrical Engineering and Computer Science, the student's bibliography must be awarded a minimum of 5 points, based on their scientific research activities. At least 1 point must be awarded for publishing research findings in the journals cited in the INSPEC database.

Masters degree studies are research oriented and include introduction to research, the development of students’ capacity for research work in individual scientific fields and disciplines, and the study of subjects providing in-depth and broad knowledge of subjects needed for the preparation of a masters thesis.

Throughout the program of study, students can use laboratories and the computer infrastructure of the Faculty of Electrical Engineering and Computer Science as well as other engineering faculties at the university. Studies leading to masters degrees grant the graduates a professional title of a Master of Science in Electrical Engineering or a Master of Science in Computer Science.

PhD research is carried out in research laboratories; a more detailed description of these programs is given in the continuation of this report. Research teams consisting of doctoral students and graduate students for individual areas of research are commonly formed. Some research teams include participants from several laboratories. International contacts developed through the teams are especially important for doctoral students, because this is the only way for them to take part in the international transfer of knowledge and exchange research achievements. Some of our doctoral students carry out part of their research abroad and even have co-mentors in other countries.

We believe that creativity, openness, peer support, and reciprocity are the bedrock of any academic co-operation. Therefore the Faculty of Electrical Engineering and Computer Science regularly hosts foreign undergraduate, graduate, and postdoctoral students. Our new organisation of doctoral studies also leads to a greater compatibility with other universities making it easier for student exchange and mobility.


STUDENT RESEARCH GRANTS

In 2001, the Faculty of Electrical Engineering and Computer Science continued to fund individual student research projects. According to internal regulations, undergraduate and postgraduate students can submit their proposals for innovative projects which cannot be financially supported within other established funding schemes. Only non-labour costs are eligible and the supported projects must be finished within 10 months.

After the call in May 2001, eleven proposals were submitted, and ten of them passed the review process and were given the requested financial support. The following projects will have to be completed by May 2002:

• Igor Jaušovec, Kosta Kovačič, Compatibility of the Smart Media cards and the GPS system • Matjaž Golič, A 32-bit logic analyser with optional two-channel analogue signal acquisition and

display of the measured quantities on a PC using the USB interface • Mateja Verlič, Boštjan Gajsler, EvoRaS–Evolution-based recognition and search in medicine –

a simulation tool • Dejan Skrivalnik, Solar V-concentrator for increasing the output power of solar modules • Saša Jevtić, iB (intelligent Bug) six-leg neuron robot • Matej Črepinšek, Implementation of the META evolution approach in the METATSPGA II tool

(evolution algorithms, automated knowledge collection) • Sašo Sršen, Bojan Pavšič, Optimisation of production processes based on computer

simulations • Goran Gerlič, GenCompiler–Genetically programmed compiler • Franc Gerenčer, GemmaCAD 2 – geometric plotter based on constraints • Damir Medenjak, Filip Potočnik, Matjaž Kvas, Janez Kitak, MIKRO–A portable computer

It is to be emphasised that Roman Čuk, a student of the 5th year of the Software major studies, was awarded, at the occasion of the Faculty Annual Celebration in November 2001, The Best Student Project Award for his project entitled Determination of delineated rectangle to an arbitrary plane surface polygon. The project was supervised by Assoc. Prof. Dr. Borut Žalik and successfully completed in 2000.


GRADUATES OF THE FACULTY OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE

In 2001, the undergraduate students of the Faculty of Electrical Engineering and Computer Science could still complete their studies according to the old system at the junior college level. At the same time, two different types of studies are available now: those leading to university degrees and studies leading to professional higher education degrees. The number of 2001 graduates is given in the table below.

2001 Graduates

Option Junior collegeLevel

Professional higher education

degree

Undergraduate university degrees

Electrical Engineering 21 69 26

Computer and Information Science 1 12 19

Electrical Engineering with Economics – – 20


MASTERS AND PhD DEGREES

16 masters degree students successfully defended their masters theses and 11 PhD students their dissertations.

2001 Masters theses

Author Date of defence

Title

COBISS number Mentor Co-mentor

Enis AVDIČAUŠEVIĆ August 31, 2001

Aspektno usmerjeno programiranje (Aspected-Oriented Programming)

6694934 Dr. Marjan Mernik Dr. Viljem Žumer

Srečko FRIDL May 11, 2001

Standardizirana izmenjava podatkov v produktnem modelu ceste (Standardized Data Exchange in the Road Product Model)

6247702 Dr. Nikola Guid Dr. Danijel Rebolj

Izidor GOLOB March 29, 2001

Arhitekture podatkovnih skladišč (Data Warehouse Architectures)

6694678 Dr. Tatjana Welzer Družovec Dr. Ivan Rozman

Branko KAUČIČ October 12, 2001

Algoritmi vidnosti nad diskretnim modelom terena (Visibility algorithms on Digital Relief Model)

11549192 Dr. Borut Žalik Dr. Nikola Guid

Robert KOVAČIČ June 2, 2001

Resonančni pretvornik z izmeničnim visokofrekvenčnim povezovalnim krogom (Resonant Converter Based on AC Tank Circuit)

6746390 Dr. Miro Milanovič Dr. Bogomir Horvat



Title


Iztok KRAMBERGER January 18, 2001

Izgradnja merilnega sistema spektralnega analizatorja s fiksno nameščenimi fotodiodami (Construction of Spectral Analyzer Measurement System with Fixed Photo-Diode Array)

6008342 Dr. Mitja Solar Boris KUPEC September 12, 2001

Izgube v razdeljevalnih omrežjih (Losses in Distribution Networks)

Dr. Jože Voršič Dr. Jože Pihler Aleksander KVAS October 10, 2001

Računalniška arhitektura s simultano večnitostjo (Parallel Computer Architecture using Simultaneous Multithreading)

6767894 Dr. Viljem Žumer Dr. Milan Ojsteršek Mitja LENIČ June 15, 2001

Načrtovanje in implementacija programskih jezikov z uporabo večkratnega dedovanja atributnih gramatik (Design and Implementation of Programming Languages using Multiple Attribute Grammar Inheritance)

6421526 Dr. Viljem Žumer Dr. Marjan Mernik Boštjan LILIJA April 9, 2001

Učinkovita raba energije (Eletric Engergy Efficiency)

Dr. Jože Voršič Dr. Božidar Hribernik



Title


Uroš NOVAK October 5, 2001

Implementacija in uporaba procesorja XSLT za transformiranje objektov (Implementation and Use of the XSLT Processor for Object Transformation)

6767382 Dr. Milan Ojsteršek Dr. Viljem Žumer Davorin OSEBIK July 3, 2001

Adaptivna digitalna sita v strukturi porazdeljene aritmetike (Adaptive Digital Filter Implementation with Distributed Arithmetic Structure)

6383382 Dr. Rudolf Babič Dr. Bogomir Horvat Tomaž ROMIH December 11, 2001

Avtomatsko nastavljanje geometrijskih parametrov televizijskega aparata (Automated Set-Up of TV Set Geometric Parameters)

Dr. Rajko Svečko Dr. Žarko Čučej Alojz ROZMAN November 24, 2001

Zasnova projekta avtomatizacije hidroelektrarn (Automation Design for Hydro-Power Plants)

Dr. Drago Dolinar Dr. Bojan Grčar Roman TUŠEK June 28, 2001

Regulacija procesov z velikimi časovnimi zakasnitvami ( Regulation of Processes with Long Delays)

6511126 Dr. Rajko Svečko Dr. Žarko Čučej Boris ŽITNIK December 10, 2001

Snovanje modernih ozemljitvenih sistemov (Design of Modern Grounding Systems)

6905878 Dr. Jože Voršič Dr. Mladen Trlep


2001 PhD theses


Title


Amor CHOWDHURY January 15, 2001

Robustna sinteza regulacijskih sistemov z upoštevanjem perfomančnih kriterijev (Robust Synthesis of Control Systems with Consideration of Performance Criteria)

6494486 Dr. Rajko Svečko Tomaž DOMAJNKO March 2, 2001

Povečanje stopnje ponovne uporabe z uporabo vzorcev (Increase of the Reusability Level Using Patterns)

6090262 Dr. Ivan Rozman Dušan DREVENŠEK June 29, 2001

Optimiranje izkoristka servo pogona asinhronskim motorjem (Efficiency Optimizing of Variable Motor Drive with Induction Motor)

6491926 Dr. Karel Jezernik Aleš HACE January 19, 2001

Robustno vodenje elastičnih servopogonov (Robust Control of Elastic Servodrivers)

23353093 Dr. Karel Jezernik Špela HLEB BABIČ April, 20, 2001

Odločitvena drevesa in mehke množice (Decision Trees with Use of Fuzzy Sets)

46469889 Dr. Peter Kokol Alenka HREN April 6, 2001

Robustno vodenje vrtilnega momenta asinhronskega motorja v servopogonih (A Robust Torque Control of an Induction Motor in Servo Drive)

6147350 Dr. Karel Jezernik



Title


Janez KAISER January 19, 2001

Diskriminativno določanje parametrov prikritih modelov markova za razpoznavanje tekočega govora (Discriminative Training of Hidden Markov Models for Continuous Speech Recognition)

111441664 Dr. Bogomir Horvat Gorazd LIPNIK November 20, 2001

Optimiranje merilne proge z modelom za določanje pogreškov posredno izmerjenih veličin (Optimisation of Measurement Line Using a Model of Off-Line Determined Errors)

6972182 Dr. Anton Jeglič Vili PODGORELEC October 2, 2001

Oblikovanje inteligentih sistemov in odkrivanje znanja z avtomatskim programiranjem (Evolutionary Decision Forests - Decision Making with Multiple Evolutionary Constructed Decision Trees)

6973974 Dr. Peter Kokol Mirjam SEPESY MAUČEC December 18, 2001

Adaptacija jezikovnega modela na vsebinsko specifično besedišče (The Topic Adaptation of Statistical Language Models)

6969622 Dr. Zdravko Kačič Milan ZORMAN March 26, 2001

Hibridni pristopi strojnega učenja (Hybrid Approaches in Machine Learning)

6450198 Dr. Peter Kokol


RESEARCH BY INSTITUTES AND LABORATORIES

The Faculty of Electrical Engineering and Computer Science is registered with the Ministry of Science and Technology as a research organisation incorporating 13 research units.

1. Computer Architecture and Languages Laboratory

Research unit head: Prof. Dr. Viljem Žumer

The research unit consists of the Computer Architecture and Languages Laboratory staff.

2. Institute of Electronics

Research unit head: Prof. Dr. Bogomir Horvat

The research unit consists of the staff of the Digital and Information Systems Laboratory, Electronic Systems Laboratory, Microcomputer Systems Laboratory, and Digital Signal Processing Laboratory.

3. Institute of Automation

Research unit head: Assoc. Prof. Dr. Boris Tovornik

The research unit consists of the staff of the Systems and Control Laboratory, Signal Processing and Remote Control Laboratory, Process Automation Laboratory, Measurements Laboratory, and Electro-Optical and Sensory Systems Laboratory.

4. Institute of Robotics

Research unit head: Prof. Dr. Karel Jezernik

The research unit consists of the staff of the Power Electronics Laboratory, Industrial Robotics Laboratory, and Kinematics and Simulations Laboratory.

5. Applied Electromagnetics

Research unit head: Prof. Dr. Božidar Hribernik

The research unit consists of the staff of the Applied Electromagnetics Laboratory and Fundamentals and Theory of Electrotechnics Laboratory.

6. Electrical Machines Laboratory

Research unit head: Prof. Dr. Ivan Zagradišnik

The research unit consists of the Electrical Machines Laboratory staff.


7. Electromechanical Systems Control Laboratory

Research unit head: Prof. Dr. Drago Dolinar

The research unit consists of the Electromechanical Systems Control Laboratory staff.

8. Computer Graphics and Artificial Intelligence Laboratory

Research unit head: Prof. Dr. Nikola Guid

The research unit consists of the Computer Graphics and Artificial Intelligence Laboratory staff.

9. Institute of Information Science

Research unit head: Prof. Dr. Ivan Rozman

The research unit consists of the staff of the Information Systems Laboratory and Database Technologies Laboratory.

10. Systems Software Laboratory

Research unit head: Prof. Dr. Damjan Zazula

The research unit consists of the System Software Laboratory staff.

11. Power Engineering Laboratory

Research unit head: Assoc. Prof. Dr. Jože Voršič

The research unit consists of the Power Engineering Laboratory staff.

12. Institute of Mathematics and Physics

Research unit head: Prof. Dr. France Brešar

The research unit consists of the Applied Mathematics Laboratory staff.

13. System Design Laboratory

Research unit head: Assoc. Prof. Dr. Peter Kokol

The research unit consists of the System Design Laboratory staff.


PROGRAMME UNITS

Since 1998, the Faculty of Electrical Engineering and Computer Science has been registered with the Ministry of Education, Science, and Sport as a research organisation incorporating 9 programme units. Since 2000, a full programme scheme financial support is given to the units. A thorough review of their scientific contributions and technical and expert contents must be presented every year. Short overviews for 2001 are gathered in the sequel.

1. Information Systems

Programme unit head: Prof. Dr. Ivan Rozman

This programme unit consists of the staff of the Information Systems Laboratory and the Database Technologies Laboratory.

Scientific disciplines: Informatic, Systems Theory, Computer Science, Numerical Analysis, Systems, Control, Artificial Intelligence, Systems Engineering, Computer Technology, Statistics, Operations Research, Programming.

The importance of technologies that enable the exchange, processing and storing of data in arbitrary form is increasing with the complexity of information systems, development of information society and Internet computing. Multimedia information systems that enable easy information exchange and are often tightly connected to real-time systems are also becoming increasingly important. Our goal is the development of methodology for formal definition and the continuous improvement of software development processes. Experiences in cooperation with partners lead us to a developed methodology, which – together with knowledge in the development of quality systems – provides for an integrated environment for software development. Research in the area of quality and process modelling headed towards the upgrade of previously developed SoPCoM methodology – Software Complexity Model. The model was tested in practical projects. Additionally, a tool was developed for methodology support, process modelling and complexity assessment. Our experiences in the process modelling of a software development process are the basis for a model for the introduction of a quality management system in an information society. In this model, the description of tasks is compatible with the SoPCoM model that can be used to assess the complexity of the tasks. Process modelling is also included in the 5th framework project TEAMWORK. The basic goals of this project are twofold-: firstly, the testing of the NQA method for process modelling and secondly, the testing and upgrading of software for document flow within a process. In the area of software development, we paid special attention to the definition of an object-oriented process for software development. Fundamental research from this area was used in the assessment of technologies for the component-based development of object-oriented Internet applications by using UML, distributed objects CORBA, Java, JavaBeans, Enterprise JavaBeans, object-relational databases and object brokers. We investigated the possibility of ensuring successful usage of object technology and component-based development in the area of modern Internet applications, usage of component-based models for the integration of new and


legacy systems and the introduction of successful reused mechanisms. The main characteristic of the integral support environment tool for the software development process is its roots in research work; it offers clear, unambiguous presentation of the software development process and is a basis for simple and successful process improvement. The tool offers complexity calculation for each task, transitions and of the whole process model. We continued with research in the real-time systems development area according to their increasing importance. We set a formal framework: with our two projects, an applicative and a fundamental one, integral development of embedded control system and reliability of the embedded control systems. We will join the methods within this framework, so that the development of an embedded control system is integral, in both software and hardware parts, with the final goal: more reliable, safer and easier to maintain systems. We cover the area of holistic approach to the development and verification of software architecture and hardware and fault-resistance. We continued with research into the development of optimal data warehousing architectures and pointed out the most common mistakes in building the data warehouse in practice. We conducted research in the area of knowledge discovery in databases and efficiency of classification algorithms. We also paid special attention to data security and data quality. We investigated the possibility of data models reuse in the area of intelligent medical systems. The last of the more important areas of our research work includes research in the area of intelligent systems. In this area we developed a method of rule extraction from fuzzy neural networks. The connection of artificial neural networks with fuzzy logic enables the construction of learning algorithms that are superior over classic neural networks, because the discovered knowledge can be given in the form of simple rules that are common in expert systems with knowledge bases. In many practical applications, the problem is in small amounts of training cases due to several reasons. In this case it is hard to find an optimal structure of neural networks because classical statistic rules do not apply. We used a principle of structural minimization with assessment of VC dimension. The principle is based on empirical risk minimization. The true error is assessed by using the combined test error and the assessed generalization error with the help of VC dimension. The testing of the new software has shown its wide applicability: in information technology, medicine, pharmacy – in areas that are successful in Slovenia and export-oriented.

2. Power Engineering

Programme unit head: Assoc. Prof. Dr. Jože Pihler

This programme unit consists of the Power Engineering Laboratory staff.

Scientific disciplines: Energy Research, Electrical Engineering, Electromagnetism, Optics.

Researchers of the Power Engineering programme group were involved in one basic project, two applicative projects, three R&D projects, three industrial projects and four international projects. The basic project is a system project, since it encompasses the monitoring and observation of perturbances in the power system caused by large Slovenian electricity consumers. The first of the two applicative projects is a part of the Environmental Protection Programme for the City of


Maribor, while the second is a comparative study on electrical power quality in the EU. The three R&D projects were the following: research work supporting the implementation of the Kyoto Protocol, laboratory for high current tests and energy balance in the Municipality of Maribor. Projects for industrial clients were the development of a new motor starter, low voltage distribution panels for outdoor use, and cable accessories and heat shrinkable tubing. International projects included a virtual electromagnetic laboratory and Web-based distance learning, CO2 emissions (The Joint Project - National CO2 Emission Baselines and Aditional Project – 5th framework project) and development of protection systems against life-threatening step and touch voltage occurring during an earth fault in the high voltage network of a coal mine, together with a proposal for efficient selective protection. The project DISPOWER – 5th framework programme is still in the evaluation phase. In addition to the above mentioned large-scale projects the members of the programme group also developed their own software for the planning of overhead lines called “PARAMETRI DALJNOVODOV”, software for protection against lightning called “SCIT”, software for computation of illuminance distribution called “IZOS”, software for computation of glittering called “UGRATING” and software for the calculation of characteristic parameters of wiring systems called “DOTIK”. The programme group organised, as in previous years, the international experts' meetings “Power Engineering” and “Lighting 2001”, as well as the local conference “Energy for Tomorrow's Maribor – Geothermal Energy”. The members of the programme group also actively participated at international conferences and published their papers in Slovenian and international magazines. The programme group achieved and even exceeded all the planned objectives in all areas of the programme group's work, i.e. power system analysis, electric power quality, energy supply, lighting and power apparatus. The most important scientific achievements:

1. Development of own computer programmes for all basic areas of the programme group's work;

2. Development of new program modules of the standard network analysis programme tool PSCAD/EMTDC, i.e. module GATECICLE for planning and monitoring of energy systems and DIALUX for computation of illuminance distribution;

3. Research, design and development of new products, testing of prototypes and thus verification of scientific development work;

4. Transfer of new products into regular manufacturing process.

3. Methods in Communications

Programme unit head: Assoc. Prof. Dr. Zdravko Kačič

This programme unit combines the staffs of the Digital and Information Systems Laboratory, Electronic Systems Laboratory, Microcomputer Systems Laboratory, and Digital Signal Processing Laboratory.

Scientific disciplines: Telecommunication Engineering, Signal Processing.


Research in the field of robust speech processing encompassed the development of methods for robust automatic fixed and mobile telephone quality speech recognition within the framework of research activities in the field of language technologies. A new noise reduction algorithm was developed that works in time domain (introduction of new weighting function that uses zero-crossing rate and short-time energy) and which enables robust speech detection in noisy signal. In the field of automatic large vocabulary continuous speech (LVCS) recognition an analysis of the influence the OOV rate of a test set on the accuracy of speech recognition for the Slovenian language was performed. In multilingual speech recognition a cross-lingual speech recognition experiment was carried out. Two sets of multilingual HMM models were used which were trained using Spanish, German, and English SpeechDat II databases. In cross-lingual speech recognition, the Norwegian language was used as a test language – Norwegian SpeechDat II database served as a test database. IPA tables were used in defining the lexicon for a Norwegian speech recogniser. The speech recognition results were improved by an adaptation procedure using a small set of Norwegian sentences. A development platform for automatic speech recognition was set up that will enable the evaluation and comparison of newly developed speech pre-processing and recognition methods within the existing reference methods. Comparative analysis of different configurations of recognisers for LVCS recognition was carried out. Word and sub-word models (stem-ending) were used for language models. Evaluation of accuracy was performed using the SNABI speech database. Experiments have shown better recognition results in case of sub-word models. A novel data driven approach of defining stems and endings was proposed for defining the sub-word models. The list of endings was defined in such a way that the smallest number of different units (stems and endings) in the training corpus was achieved. In the framework of data-driven prediction of symbolic prosody for Slovenian language the available speech database was semi-automatically labelled. Two types of symbolic labels were used: labels for the prediction of segmental breaks and labels for the prediction of segmental accents. The automatic prediction of prosody breaks was made using neural networks. The achieved accuracy was greater than 90 %. The second group in the research programmes goals includes the development of new and the improvement of existing mathematical tools for system specification and verification, the development of new and improvement of existent software tools for formal verification of reactive systems using mathematical tools, as well as the application of mathematical and software tools for ensuring the correctness of practically relevant systems. The following research activities in accordance with the goals were carried out during 2001. We improved our BDD-based computer-aided tool EST for verification of finite-state systems described in the style of CCS. We completed the implementation of searches for counter examples and witnesses during system verification using ACTL model checking. In order to make the writing of ACTL specifications easier for non-specialists, we developed patterns of ACTL formulas for the most often specified properties. CTL patterns were also reconsidered. We upgraded our computer-aided tool for verification of digital synchronous sequential circuits, which, like EST, is based on our home-made software package for the efficient manipulation of binary decision diagrammes. We found that this tool could be employed for the generation of test sequences needed for the detection of stuck-at faults in digital circuits. We implemented the necessary procedures for searching witnesses resp. counterexamples during CTL model checking. We introduced a way of writing structural circuit specifications. We implemented the automatic generation of CTL formulas which express the


existence of single stuck-at faults in the circuit, and the generation of circuit outputs, which are necessary in order to detect such faults during testing. We also began to investigate how the EST tool could be employed for the formal verification of digital circuits. As a part of this activity, we implemented a special parallel composition procedure, which enables communication of the output of a circuit element with several inputs of other circuit elements. We studied how to use the temporal logic of actions for verification when mobile processes can communicate as desired in spite of some physical link disconnections. We proposed a new approach to the specification and verification of synchronous sequential circuits using the SDL language, the ObjectGEODE toolset, and the MSC and GOAL languages it supports. Another research goal was an efficient implementation of protocol stacks for the IP telephony in embedded, real-time systems. The emphasis was on space and time complexity as well as on concurrent execution.

4. Electromechanical Systems Control

Programme unit head: Prof. Dr. Drago Dolinar

This programme unit consists of the Electromechanical Systems Control Laboratory staff.

Scientific disciplines: Electrical Engineering, Automation, Robotics, Control Engineering, Electromagnetism, Mathematical and Gen. Theoretical Physics, Classical Mechanics.

This research programme is composed of two topics. The research objective of the first topic is the development of new dynamic models of electromechanical devices, development of new methods for parameter determination and design of new systems for the control of electromechanical devices. The first subject under investigation was the modelling and control design of high performance drive with Linear Synchronous Reluctance Machine (RSLM). A nonlinear dynamic model of the LSRM was developed, verified and validated. The model contains a magnetically nonlinear and anisotropic model of the LSRM iron core, and the position and current dependent characteristics of the thrust and friction force. All required characteristics have been determined experimentally. Furthermore the control of a permanent synchronous machine working in the field weakening region was designed and a method was proposed for higher harmonics compensation. The developed solutions were dynamic, therefore the perfect tracking of the reference position trajectory is assured even in the field weakening region. In the framework of the applied research programme the experimental system of active magnetic bearings (AMB) was developed. The design of AMB was achieved in cooperation with the KU Leuven, ESAT/ELEN, Professor K. Hameyer, whilst the design of the rotor (system) shaft was achieved in cooperation with the KU Leuven, MECH/PMA, Professor W. Heylen. The development of the power supply, electronics and the control is based on our knowledge and experiences. Magnetic bearing force was measured in order to determine the mathematical model by continuous analytical functions. A control design was implemented based on the derived mathematical model. An improvement in the static and dynamic system performances was created. We have created the design as well as manufacturing the AMB experimental system. The


modular type of realization and the user friendly control desk make it possible to use the system in applied and theoretical research as well as for educational purposes. The research objective of the second topic is dynamic power system modelling, control and unit protection. We claim that network modelling can be performed equally based on instantaneous state variables or by using dynamic phasor quantities. Analysis tools for the interaction of power system transients with protection operation have been developed. During the testing phase the new protection algorithms were based on the analytical signal processing methods applied to the power transformers and transmission lines. The transformer turn-to-turn faults are the focus of our current research. This fault type represents a great challenge for existing relays since they are unable to recognize turn-to-turn faults in the early development stage. We hope first to develop an appropriate model describing this fault type with sufficient accuracy based on the great number of measured samples on the laboratory power transformer. The deeper knowledge obtained will be later used to improve the sensitivity of the protection algorithms.

5. Automation

Programme unit head: Assoc. Prof. Dr. Boris Tovornik

This programme unit combines of staffs of the Process Automation Laboratory and Electro-Optical and Sensory Systems Laboratory.

Scientific disciplines: Automation, Robotics, Control Engineering, Instrumentation Technology.

The following research activities were completed according to plan during the course of the year 2001:

1. Fiber optic based interferometer balancing system: - The high temperature furnace for heating optical fibers was realised. - The electronic circuit for heater controller was developed. - The electronic circuit based controller for the linear translator designed for stretching

optical fibers was developed. - A PC computer based software was made for supervising the balancing system.

2. Miniature fiber-optic medical pressure sensor: - A pressure sensor was developed based on the gold foil diaphragm. - An electro-optic system was completed for the fiber-optic medical pressure sensor. - The system control software was made.

3. Remote control systems: - Field network technologies were reviewed and analysed. LONWORKS technology was

analysed as a perfect solution for design, realisation, installation and support of the control networks.


- A Three-phase MT330 Energy Power Counter was developed with integrated tariff device, real-time clock, data processing and saving, external power consumer control possibility and LON communication.

- A LON.dll library was added to the CATS control software package for controlling and testing the MT330 power counters in the production phase.

- Fault detection and diagnostic systems. - Different methods for fault detection and diagnosis were tested and compared to the

laboratory heat exchanger application. 4. Fuzzy Welding Control in MIG/MAG Gas Metal Arc Welding:

- Measurement equipment and methods for measuring significant gas metal arc welding process variables were developed and were implemented by measurements done at the Varstroj d.d. company. Repeated welding experiments were assured by an application of a welding robot. The laboratory equipment enables measurements of electrical variables (the welding current, and the welding voltage) and process signal analysis (the signal shape and the frequency, typical time intervals, probability density distributions, etc.) in real time.

- Significant measurement of process variables was done in short-circuit gas metal arc welding. The new VPS 5000 welding device was used.

5. Intelligent buildings: - Intelligent building system technology is one of the fastest increasing spheres of

automative activities. A model of the intelligence building using the LonWorks Control network was developed for the necessary control networks testing.

- The LON WEB server was built and the local control network was connected to the internet.

- The mathematical model was made of the building energy conditions.

Findings:

1. The accuracy and simplicity of the balancing system beyond every known balancing method. Thus, the balancing system is an indispensable instrument for fiber-optic sensor development.

2. The diameter of our miniature fiber-optic medical pressure sensor is 0.1 mm. It is the thinnest sensor with satisfactory accuracy and it has sufficient dynamic properties.

3. Quite a lot of network technologies are present on the market (CAN, Profibus, FIP, LON, BitBus, Interbus-S, Sercos, ...). No particular one is designed as general standard. The TCP/IP protocol is more and more valued as LAN standard. A LON.dll library was included in the control CATS software package for controlling and testing the MT330 power counters in the production phase. This project enables hardware and software changes during realisation.

4. A lot of fault detection and diagnosis methods are suitable for application on it because of the non-linear character of the heat exchanger. Different tools for process linearisation are


attainable. A linear model is unsuitable for the detection of all possible errors. The non-linear state observer is proposed for better fault detection and diagnosis.

5. New measurement equipment and the welding robot enable measurement and analysis of significant gas metal arc welding process variables in real time. Experimental results have shown that electrical process variables (the welding current, and the welding voltage) are useful information for detecting changes in weld quality. On the basis of the statistical analysis and frequency analysis of significant gas metal arc welding process variables On-line quality monitoring is possible.

6. The Intelligent House model is suitable for testing new technologies, where most important systems needed in up-to-date buildings are integrated: security, fire prevention, heat, ventilation and air-conditioning systems, lighting, power management and other devices. The distance control and the reduction of the energy consumption is made possible by connection to the internet. Calculation of the energy consumption saving is achieved based on simulations.

6. Computer Systems, Methodologies and Cybernetics

Programme unit head: Prof. Dr. Viljem Žumer

This programme unit combines the staffs of Computer Architecture and Languages Laboratory, the Computer Graphics and Artificial Intelligence Laboratory, and the System Software Laboratory.

Scientific disciplines: Systems Engineering, Computer Technology, Computer Science, Bioinformatics, Medical Informatics, Biomathematics, Imaging, Image Processing, Signal Processing, Computer-Assisted Education.

The National programme groups Computer Systems, Methodologies and Cybernetics combine their research potential in the whole Institute of Computer Science. In the year 2001 our research work was devoted to the following research areas: semantics and implementation of programming languages, a study of natural phenomena, algorithms for surface flattening, development and implementation of algorithms of computational geometry, researching the decomposition of bioelectrical signals, analysing ultrasound images, building virtual computer environments for learning and training, with methods for design of intelligent systems, with heterogeneous processing and web technology. The automatic generation of language-based tools (compilers/interpreters, editors, debuggers, etc.) has been explored in the field of programming languages. We were able to automatically generate a program visualizer and program animator from formal specifications of LISA compiler generator together with Portuguese partner. Furthermore, we worked on methodologies for the development of domain-specific and aspect-oriented languages. The aspect-oriented language AspectCOOL was developed using a LISA compiler generator which enables separate compilation of aspect and component codes. In the field of natural phenomena animation, we studied the animation of clouds. We found out that the still image generation of a cloud is simple, while the realistic animation of their movement is a harded problem. Since this problem is as yet unsuccessfully solved, this research was very


interesting. Our research was also dedicated to solving the problem of surface flattening, where we started to develop a new method for the reconstruction and flattening of digitalized surfaces. This method can be used in industrial branches where the objects are composed of plane materials, for example, in the shoe industry. In the field of computational geometry, we were concerned with the development and implementation of various algorithms of computational geometry (geometric buffers, polygon trapesoidation, a repetitive point-in-polygon test for large sets of points, merging a set of polygons, determination of differences between two sets of polygons), and by the acceleration of these algorithms (sweep-line scanning, two-level uniform space subdivision) applicable in geographical information systems (GIS). A significant part of our research work turned towards the representation, compression, transmission and visualisation of large sets of geometrical data in the internet environment. We also developed a rather simple, but efficient algorithm for spatial visualisation of medical data presented by voxels, obtained from a sequence of 2D images. In the field of geometrical modelling, we have continued to develop and implement our original approach to the constraint-based geometric design in 2D space, as presented a year ago. Our latest research is directed at solving the problems that cannot be constructed by a ruler and a compass only, to giving an ability to a user to define his/her own types of geometrical elements and constraints, and to an incremental design of the algorithm. We tested the decomposition of bioelectrical signals using least-mean square (LMS) optimisation with third-order cumulants of myoelectric (EMG) signals. We focused on the autocumulants solely and checked how the use of optimisation performs in noisy environments. Using synthetic EMG signals, the approach proved robust and able to lead to a thorough decomposition of multichannel model based only on the autocumulants (we experimented with a two-input three-output model). In collaboration with the Teaching Hospital of Maribor, we developed a computer programme for detection of blood vessels and blood volume surrounding a dominant ovarian follicle. The programme has been implemented and has already introduced important scientific medical results that are going to be published in the highest ranking journals in 2002. In 2001, the development of virtual learning and training environments was still dealing mainly with the virtual delivery room. We improved the baby's vital signs significantly, especially by adding new principles of skin-colour changes and facial mimics. New scenarios were introduced, such as simulating peripheral cyanosis. The most important achievement in this field was the selection of the virtual delivery room project for a Finalist at the Stockholm Challenge Award 2001, the competition of innovative technologies. We have developed new methods for the design of intelligent systems and expanded the application of intelligent systems to new fields of medicine and education. The new methods are based on evolution algorithms and hybrid methods. We have developed methods for generating decision trees with the use of rough sets-neural networks hybrid, information induction, fuzzy decision trees, parametric independent evolution of decision trees, and AREX rule generator. A portal which simplifies the creation, integration and management of information contents is developed on the web technologies area. Basic features are document management, search facility, integration of internal services with external information systems, cross referencing of data and services, information categorization, independency of data to different user interfaces and


electronic media, multi language support, authorization of access to data and services, content and user interface personalization. We have developed our own authentication system, which is based on a LDAP directory service and a horizontal service based on “Blacksmith” framework for integration of other horizontal and vertical services. In this year we have upgraded “Blacksmith” framework with an Experimental XSLT processor for objects (EXPO), which performs mapping between object model and XML documents based on XSLT style sheets.

7. Cybernetics

Programme unit head: Assoc. Prof. Dr. Vojko Matko

This programme unit comprises the staffs of the Systems and Control Laboratory, Signal Processing and Remote Control Laboratory, and Measurements Laboratory.

Scientific disciplines: System Information Theory; Automation, Robotics, Control Engineering, Telecommunication Engineering, Metrology, Physical Instrumentation, Artificial Intelligence.

The Cybernetics Research Programme covers goals, researches and studies of new laws, methods, algorithms, procedures in measurements, signal processing, communication and controlling carried out by three laboratories (Laboratory for Control and Systems, Laboratory for Signal Processing and Remote Control and Measurements Laboratory). This inter-disciplinary program envisages modern methods of planning intelligent measurement and regulation systems based on communication, multimedia and modern program systems for signal acquisition and processing. The research carried out by the Measurements Laboratory is directed towards developing new measurement methods, computer-based measurement data acquisition and towards processing measurement uncertainty with emphasis on resonant methods. Special emphasis is placed on the use of quartz crystals (for measuring relative dielectricity and very small changes of non-electric quantities), development of remote measurements via Internet and LAN network, resistance measurement of materials accumulating electric charge and on comparative measurement of position, speed, height, accelerations using satellite signals and various databases (Autoroute, Atlas Slovenije, Jeppesen). To meet the needs of the industry the Measurements Laboratory is engaged in the development of special measurements of pile load bearing in construction, of large object vertical displacement laser measurements and in the design of measurements in the modern home. The laboratory interests also lie in the modelling of measuring uncertainty and development of an EMI filter designed to reduce disturbances caused by digital switching circuits. The research work of the Laboratory for Control and Systems specializes in the field of control and regulation systems in the theoretical and practical research of classical and modern control system methods and procedures. In particular, this research work is concerned with adaptive, predictive and robust systems. Since 1996 the Laboratory has been active in the research of predictive regulation systems based on robust models and robust synthesis method in H2 and H∞. The Laboratory also works on intelligent systems theory, in particular on the neurone network systems. In the field of multimedia, the Laboratory is engaged in the research of user-friendly software


applications, man-computer communication and in the development of distance learning, which includes the designing of content and study techniques as well as data transfer technologies. Laboratory for Signal Processing and Remote Control is active in the theoretical scientific fields of signals, information and telecommunications. Recent research work has been directed towards basic research work on intelligent algorithms of 3D image context-based compression and processing, towards ATM network control, planning and development of new algorithms in cable communication and GSM networks, controlling radiator radiation using computer vision, setting image parameters on cathode screens using polynomial methods of edge modelling in pattern recognition and hybrid optimization algorithm, and towards a hybrid regulation algorithm which enables implementation of new control strategies replacing the classic pulse width modulations in controlling power switch controllers.

8. Applied Electromagnetics

Programme unit head: Assoc. Prof. Dr. Mladen Trlep

This programme unit consists of the staffs of the Applied Electromagnetics Laboratory, Electrical Machines Laboratory, and Fundamentals and Theory of Electrotechnics Laboratory.

Scientific disciplines: Electrical Engineering, Electromagnetism.

Within the framework of the research programme “Applied Electromagnetics”, parallel work is carried out in three fields, with the ultimate aim of incorporating all the knowledge into a complex system which will, as accurately as possible, cover all the demands of a real electromagnetic problem. The three fields are:

- research and development of mathematical models for defining magnetic, electrical, current and temperature field under stationary and dynamic conditions,

- development of measurement methods for defining the real characteristics of material, - development of models to be used for solving inverse problems in electrotechnics.

The first part focuses on the numerical methods for electromagnetic field calculation, namely the finite element and boundary element methods. The development and application of the above methods are directed to CAD program solutions on concrete objects. In most cases, these objects are electromechanical converters, actuators, switches, insulating and grounding systems, etc. The development of measurement methods focuses on measurement methods for accurately defining the real characteristics of materials and losses in them, which is necessary for a more realistic mathematical model of the electromagnetic system. This work is carried out using methods for defining magnetization and hysteresis curves, on a determination of pulsating and rotational losses in magnetic materials and on the production of measurement yokes for different shapes (square and circular) of measurement specimen. Software for supporting the measurement methods is developed. The aim of the calculation is to find out the area in the specimen, where the magnetic field is homogeneous enough to measure the material characteristics. The problem is calculated as a three dimensional non-linear transient problem. The influence of the z component of magnetic density and the influence of the eddy currents on


field homogeneity in the specimen is analysed. The comparison between measured and calculated values of magnetic field confirms the regularity of the calculations. We decided on a special variation of the boundary element method, the so-called DRM method, for solving the inverse problem, which enables simpler operations in the domain, where we want to determine the inverse problem. Our initial work has been directed to problems of 2D static fields, where we detect any unknown distribution of electromagnetic field sources, or rather, unknown material property. Both problems are very prevalent in bioelectromedicine, for searching defects in material structure, for development of measurement methods, etc.

9. Institute of Robotics

Programme unit head: Prof. Dr. Karel Jezernik

This programme unit combines the staffs of the Power Electronics Laboratory, Industrial Robotics Laboratory, and Kinematics and Simulations Laboratory.

Scientific disciplines: Automation, Robotics, Control Engineering, Motors and Propulsion Systems.

The research year 2001 was very fruitful for our program unit. The results of our research work were published in international scientific journals of the first category and we have to stress that the results in the area of automation and robotics can only be published if the theoretical work is supported and confirmed through experimental verification. We can report on the published results of the control theory of nonlinear mechanisms using the robust sliding mode control approach. A robust control algorithm based on the PI load estimator that is able to effectively compensate for friction, elasticity and compliance in servo drives was developed and implemented on a 2-axis XY table toll machines by industrial application. Intensive research work was done on a second order perturbation estimator implemented in DD robot mechanism. The frequency characteristics of a closed loop system was altered by using this estimator, so that the high frequency contents are attenuated too. A fuzzy logic-based perturbation estimator was developed in the framework of the same research. The research results showed that by using this estimator the influence of noise in the measured signals is minimized. Consequently the quality of the perturbation estimation is significantly improved. The results of this work were presented at a few international conferences. The special value at this work concerns the application of the developed fuzzy perturbation estimator in a robot position control. A sliding-mode based nonlinear control algorithm was also successfully implemented in AC motor drives. In this area an induction motor drive for electric vehicle is the most attractive project. The research work was focused on the control of the induction motor without mechanical sensors and the results were presented in Berlin at the EVS-18 conference and published in the European Journal as the best contribution from the PEMC'00 Conference, Košice, Slovakia. As a main result a new mechanical sensorless observer of electromagnetic force (EMF) and rotor flux was developed and the results were presented at an invited lecture at the IECON'01 in Denver and two invited lectures at the Technical University in Istanbul (Turkey) and at the University in Wisconsin (USA).


The experimental set-up of 130 kW power operating at 500 V voltage for the high pressure hydraulic pump in the mine (Rudnik lignita Velenje) was also built. Several successful tests were performed on the experimental set-up in our lab as well as in the mine. The most critical operating conditions in this explosive high risk environment were considered in the development of the voltage/frequency inverter, microcontroller and implemented software. The last part of our research programme was dedicated to computer aided design of the real-time control systems in a Matlab/Simulink environment. The gained knowledge allowed us to serve as a consultant to many Slovenian enterprises in the area of fast new products development. In the postgraduate education of the young researchers the new didactic procedures based on the internet were incorporated into the study. At the conference IMS'01 in Carigrad, Turkey we reported on our gained experiences about the internet based study as experts from the European Community.


OVERVIEW OF PROJECTS AND STAFF BY RESEARCH UNITS

Number of staff members Number of projects

RU RS TE TS JR Total AP BP RD Int. Other Total

1. 12 3 2 17 6 1 3 3 13 2. 6 19 5 8 38 3 3 13 19 3. 3 17 5 5 30 4 9 4 2 7 26 4. 3 11 5 2 21 4 3 1 1 9 5. 6 1 1 8 1 1 1 2 4 9 6. 1 2 2 5 1 1 2 7. 1 4 1 2 8 1 2 2 1 6 8. 6 1 4 11 1 1 2 2 6 9. 3 18 6 4 31 5 1 1 5 12 24 10. 7 1 1 9 1 4 5 11. 6 2 8 2 1 4 4 3 14 12. 10 10 5 5 13. 2 4 6 4 1 15 1 21

Total 17 120 32 33 202 31 26 20 51 31 159

RU – research unit AP – applied projects

RS – researchers BP – basic-research projects

TE – teaching staff RD – research and development tasks

TS – technical staff Int. – international projects

JR – junior researchers Other – projects of the industry and the Municipality of Maribor

Institute of Automation AU – 1

INSTITUTE OF AUTOMATION

Head:

Prof. Dr. Karel Jezernik

Phone: +386 2 220 73 00

E-mail: [email protected]

URL: http://www.au.feri.uni-mb.si/index.html-l2

The Institute of Automation participates in basic and applied research in the fields of electrical and high precision measurement of electrical and non electrical quantities, measurement automation, signal processing, and remote control, sensor systems, systems theory and control, modelling, identification, computer control of processes, system design in automation, software in automation, expert system in automation, fuzzy control systems, man-machine communication, electro-optics systems, programmable logic control systems, and real time control systems.

The Institute of Automation co-operates with many institutes abroad: Technische Universität Graz - Austria, Technische Universität Wien - Austria, Politehnikais Instituts Latvijas, Riga - Latvia, Fachhochschule München, Technische Univerersität München - Germany, Deutsche Forschungsanstalt für Luft- und Raumfahrt Oberpfaffenhofen - Germany, Ecole Polytechnique Féminine, Sceaux, Paris - France, Guangxi University of China, Nanning - China, Elektrotehnički fakultet, Zagreb - Croatia, Tehniška univerza, Bratislava - Slovak Republic, University of Sarajevo - Bosnia and Herzegovina, Faculty of Electrical Engineering in Pragua and Brno - Czech Republic.

The members of the Institute of Automation belong to five laboratories, which also includes one centre of technology.

AU – 2 Institute of Automation

Systems Control Laboratory

Head: Assoc. Prof. Dr. Rajko Svečko

Signal Processing and Remote Control

Laboratory Head:

Assoc. Prof. Dr. Žarko Čučej

Process Automation Laboratory

Head: Assoc. Prof. Dr. Boris Tovornik

Measurements Laboratory Acting Head:

Assoc. Prof. Dr. Vojko Matko

Electro-Optics and Sensor

Systems Laboratoy Head:

Prof. Emeritus Dr. Dali Đonlagić

Institute of Automation Head:


Institute of Automation AU – 3

Systems Control Laboratory

Head: Assoc. Prof. Dr. Rajko Svečko

Employees: Asst. Prof. Dr. Matjaž Debevc; Dr. Martina Leš; Dr. Amor Chowdhury; Boris Ratej, BSc; Josip Vrbanec, MSc; Metka Zorič Venuti, MSc; Andrej Knuplež, Ing.

Signal Processing and Remote Control Laboratory

Head: Assoc. Prof. Dr. Žarko Čučej

Employees: Dr. Bojan Gergič; Dr. Peter Planinšič; Jože Mohorko, MSc; Dušan Gleich, BSc; Mihael Kaiser, BSc; Martin Pec, BSc; Tomaž Romih, BSc

Process Automation Laboratory

Head: Assoc. Prof. Dr. Boris Tovornik

Employees: Asst. Prof. Dr. Nenad Muškinja; Dr. Marjan Golob; Stojan Peršin, BSc; Alojz Hojnik, Ing.

Part-time employed: Aleksander Polutnik, MSc

Measurements Laboratory

Acting Head: Assoc. Prof. Dr. Vojko Matko

Employees: Dr. Gorazd Lipnik; Ladislav Mikola, MSc; Stanislav Lampič, Ing.; Miloš Vute, Ing.

Electro-Optics and Sensor Systems Laboratory

Head: Prof. Emeritus Dr. Dali Đonlagić

Employees: Asst. Prof. Dr. Denis Đonlagić; Edvard Cibula, BSc

AU – 4 Systems and Control Laboratory

SYSTEMS AND CONTROL LABORATORY

Head:

Assoc. Prof. Dr. Rajko Svečko

Phone: +386 2 220 71 40


RESEARCH PROJECTS

Current research projects

Basic research project

Modern Control Theory

Leader: Assoc. Prof. Dr. Rajko Svečko Participants: Dr. Amor Chowdhury; Josip Vrbanec, MSc; Martin Pec, BSc; Dalibor

Igrec, BSc; Aleš Mirnik, BSc

Financed by: Systems and Control Laboratory and Ministry of Science and Technology of the Republic of Slovenia

Controller design problems were originally formulated in the frequency domain. The main tools used during the early phases of research into this class of problems have been operator and approximation theory, spectral factorization, and (Youla) parametrization, leading initially to rather complicated (high-dimensional) optimal or sub-optimal (under the H-infinity norm) controllers.

Riccati equations of the type that arise in linear-quadratic differential games play a key role. These findings have prompted further accelerated research on the topic, for more direct time-domain (state-space) derivation of these results.

Among different time-domain approaches to this class of worst-case design problems, the one that uses the framework of dynamic (differential) game theory seems to be the most natural. This is because the original H∞-optimal control problem (in its equivalent time-domain formulation) is in fact a minimax optimization problem, and is therefore a zero-sum game, where the controller can be viewed as the minimizing player and disturbance as the maximizing player. Using this framework, our research focuses on a complete theory that encompasses continuous-time as well as discrete-time systems, finite as well as infinite horizons, and several different measurement schemes. We also discuss extensions of linear

Systems and Control Laboratory AU – 5

theory to nonlinear systems, and derivation of lower-dimensional controllers for systems with regularly and singularly perturbed dynamics.

Currently we are engaged with several problems such as: • Development of the robust controller synthesis method for systems where the

performances demand is asymptotic tracking to the sinus reference signal. • Order minimization of synthesis weight functions. • Study of the connection between the pole placement and the H∞ synthesis.

Research and development projects

Computerized admittance control system

Leader: Assoc. Prof. Dr. Rajko Svečko Participants: Boris Ratej, MSc; Dr. Amor Chowdhury; Josip Vrbanec, MSc; Andrej

Knuplež

Financed by: Systems and Control Laboratory

The computerized admittance control system is globally composed of a monitoring computer, an interface between RS232 and CAN bus, and a CAN bus and microcontroller interface, which manages a contactless card reader and controls an electric key-lock and other light and acoustic signals. The computerized admittance control system also offers absolute control over access into certain areas (rooms) besides keeping track of working time. It enables data acquisition regarding arrival and departure time, view over the circulation of people between various areas, and monitored access into every area included in the system. Using the data, which are saved in the monitoring computer, varied statistical analysis is possible (for example space occupation, utilization of equipment, presence of employees, etc).

The basic operation of admittance control systems is identification. Data are divided according to identifying devices on the PIN code, magnet storage media, finger print, voice, etc. and by procedures themselves divided into the contact and contactless ones. Because the contactless memory medium has many advantages, the contactless smart cards from system LEGIC® are used in our admittance control system.

The user interface, implemented on the monitoring computer, is capable of monitoring and completely controlling of the entire system.

Control Systems Theory Education Tool

Leader: Assoc. Prof. Dr. Rajko Svečko Participants: Dr. Amor Chowdhury, Andrej Knuplež


Financed by: Systems and Control Laboratory

Many concepts involved in control system theory including visualization and symbolic computations could also be done in MATLAB™. It is easy to learn its syntax, but the amount of functions designed for control systems is still increasing and can cause ineffective use. To overcome this problem, examples should be well organized and documented. This was the basic idea of building an additional user interface with links to manuscripts (lectures and computer exercises) in electronic form.

The user interface is prepared in Slovenian language because it is also very important to provide as much information as possible in the native tongue. The Linear Systems Theory Education Tool is designed for the undergraduate electrical engineering students, who initially work with Matlab and will then continue with control systems studies. The interface and the environment are organized in such a way, that it could be extended for other similar subjects in Control Engineering studies.

The Linear Systems Theory Education Tool consists of a main navigation menu and four main graphic units: submenus for navigation through chapters, help, explanations (tutorials) and a graphic presentation window. Additionally, html-help and connections to electronic manuscripts have been prepared. This graphical environment provides show and help in MATLAB™ standard forms and they have been changed only in some details (e.g.: navigation controls and pop-up menus are supplemented in the Slovenian language). It is built in such a way, that its conformation into any other language mostly demands simple translation of comments. The effectiveness is enlarged by the use of Matlab’s p-code and multimedia and distance learning capabilities during World-Wide-Web, for future developments.

Industrial project

Central supervision system

Leader: Assoc. Prof. Dr. Rajko Svečko Participants: Dr. Amor Chowdhury; Josip Vrbanec, MSc; Andrej Knuplež

Financed by: Varnost Priva d.o.o. Maribor, Slovenia

Technical security is build on different technical systems. Each of the systems (fire alarm, burglary alarm) is usually closed, independent and works autonomously. Incompatibility of the technical security appliance and software equipment of the different producers and the autonomous system work concept are the two major problems for the supervision center, where all information about what is happening on the object flows in.

The security service can become complicated and non-transparent because of the huge range of installed hardware and software equipment on the object. The main goal of this


research project is a study of the different technical security systems and development of software equipment for the informational integration of different technical security systems on the supervision computer. The second part of the project is the development of a software user interface intended for the graphical display of security events on the object.

Completed research projects 2001

International project

UM_JEP-14013-1999 Development of the Department for Technology-Supported Distance Education (Participation in Tempus Phare project)

Leader: Asst. Prof. Dr. Matjaž Debevc Participants: Boris Ratej, MSc; Andrej Knuplež

Financed by: European Union Duration: Oct. 1999 – Oct. 2001

The main goal of the DETECH project is the development of the Department for Technology-Supported Distance Education within the Centre for Distance Education Development at the University of Maribor. This project will offer co-ordinated adjustment and use of current activities and technological results of individual university faculties and partner universities, operating in distance education areas. This service will also offer logistical, operational, and technological support to other faculties and European universities, which are introducing distance education.

Members of the System Software Laboratory participate in this project by (a) offering expertise in the field of software-supported conceptual learning, (b) setting up of the technological services of the Centre for Distance Education Development and (c) organising project meetings.

In collaboration with the video production team of the Centre we have prepared the first Slovenian video supported web presentation of the PhD defence (http://www.cded.uni-mb.si/predavanja/dr/potocnik).

PUBLICATIONS

Riko Šafarič, Matjaž Debevc, Rob M. Parkin, Suzana Uran, “Telerobotics experiments via Internet,” IEEE trans. ind. electron., Vol. 48, No. 2, pp. 424-431, Apr. 2001.


Martina Leš, Rajko Svečko, “Verbesserung der nichtparametrischen prädiktiven Regelung von nichtminimalphasigen Regelstrecken,” Automatisierungstechnik, Jg. 49, H. 3, pp. 132-137, 2001.

Rajko Svečko, Boris Ratej, “Mikrokrmilniški sistem brezkontaktne identifikacije in nadzora pristopa,” Inf. MIDEM, Vol. 31, No. 3, pp. 185-190, 2001.

Žarko Čučej, Peter Cafuta, Rajko Svečko, “Tokovna regulacija skupka napetostno izvorni pretvornik - izmenični motor brez uporabe modulatorja,” Inf. MIDEM, Vol. 31, No. 2, pp. 74-83, 2001.

Boris Ratej, Amor Chowdhury, Rajko Svečko, “Some results of transfer rate tests in two-way cable networks,” Electrotechnical Review, Vol. 68, No. 2/3, pp. 171-177, 2001.

Matjaž Debevc, “Uporaba spletnih video tehnologij za gluhe in naglušne,” Iz sveta tiš., Vol. 21, No. 4, pp. 5, 2001.

Rajko Svečko, Dalibor Igrec, Amor Chowdhury, Josip Vrbanec, Martin Pec, “Vodenje enosmernega “brushles” motorja z digitalnim signalnim mikrokrmilnikom,” Svet elektron., Vol. 8, No. 76, pp. 34-36, 2001.

Matjaž Debevc, “Uporaba tehnologij v izobraževanju na daljavo,” Uporab. inform., Vol. 9, No. 3, pp. 140-147, 2001.

Matjaž Debevc, Boštjan Vlaovič, Oblikovanje dokumentov za svetovni splet. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Bojan Slemnik, Staša O'Dea, Matjaž Debevc, Angleško-slovenski besednjak izobraževanja na daljavo. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Josip Vrbanec, Amor Chowdhury, Martin Pec, Rajko Svečko, “Postopek in priprava robustne standardizacije in klasifikacije realnih objektov,” Patent Request No. P-200100239, Ljubljana, Urad Republike Slovenije za intelektualno lastnino, Sept. 21, 2001.

Amor Chowdhury, Rajko Svečko, “Robust synthesis with consideration of performance criteria's,” International summer school of automation, Maribor, Slobenia, June 2001, pp. 7-11.

Martina Leš, Rajko Svečko, “Teaching control systems theory using linear systems education tool,” European Control Conference ECC ´01, Porto, Portugal, Sep. 2001, pp. 3326-3331.


Matjaž Debevc, “Using Internet video technologies for deaf and hard of hearing people,” Assistive technology - added value to the quality of life AAATE '01, Ohmsha, Vol. 10, pp. 443-448.

Matjaž Debevc, Dean Korošec, “The role of the department for technology supported distance education in Slovenian school environment,” The future of learning - learning for the future, Hagen, 6 pp.

Matjaž Debevc, Samra Mujačić, “Hypermedia lecture-room: new teachng environment,” International Conference on Software, Telecommunications and Computer Networks SoftCOM 2001, Split-Dubrovnik, Croatia, Ancona-Bari, Italy, Oct. 2001, pp. 683-690.

Martina Leš, Rajko Svečko, “Linear systems theory education tool,” The IASTED International Conference Modelling, Identification, and Control, Innsbruck, Austria, Feb. 2001, Vol. 1, pp. 500-504.

Matjaž Debevc, Dean Korošec, “Video supported web learning,” World Conference on Educational Multimedia, Hypermedia and Telecommunications ED-MEDIA 2001, Tampere, Finland, June 2001, pp. 381.

Dean Korošec, Damjan Zazula, Matjaž Debevc, “Tools and toys for learning with the Web - examples from electrical engineering, computer engineering and medicine,” Internet based education, Bratislava, Slovakia, 1 pp.

Matjaž Debevc, Katja Prnaver, G. Pačnik, “MPEG-4 standard overview,” 24th international convention MIPRO 2001, Opatija, Croatia, May 2001, pp. 43-45.

Bogdan Dugonik, Matjaž Debevc, “Contemporarily video production for distance education system,” 3rd International symposium on Video processing and multimedia communications VIPromCom 2001, Zadar, Croatia, June 2001, pp. 221-224.

Milan Perko, Matjaž Debevc, “Kabelska omrežja v Sloveniji: organiziranost, razvitost in nivo storitev,” Dostop do telekomunikacijskih storitev, Ljubljana, Slovenia, 6 pp.

Amor Chowdhury, Peter Cafuta, Rajko Svečko, “Inward approach of the robust controller synthesis,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 201-204.

Marko Habjanič, Amor Chowdhury, Dalibor Igrec, Rajko Svečko, “Informacijska integracija sistemov tehničnega varovanja,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 147-150.


Boris Ratej, Amor Chowdhury, Matej Žunkovič, Rajko Svečko, “Avtomatizacija telekomunikacijske povezave mobilnega novinarskega mesta,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 115-118.

Dean Korošec, Matjaž Debevc, “Pretočni video za izobraževanje,” Mednarodna izobraževalna računalniška konferenca - MIRK 2001, Piran, Slovenia, May 2001, pp. 195-200.

Matjaž Debevc, “Experiences from development of the department for technology supported distance education - project DETECH,” The 2nd International DETECH Workshop, Maribor, Slovenia, Sept. 2001, pp. 129-135.

Dalibor Igrec, Josip Vrbanec, Martin Pec, Amor Chowdhury, Rajko Svečko, “Vodenje enosmernega “brushles” motorja z digitalnim signalnim mikrokrmilnikom,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 66-70.

PRESENTATIONS BY THE LABORATORY MEMBERS

Matjaž Debevc, “Tehnologije pri izobraževanju na daljavo,” a talk within the seminar on distance learning entitled Učenje na daljavo kot možnost in izziv, Jan. 26, 2001.

Matjaž Debevc, “Televizija v funkciji izobraževanja na daljavo,” a talk at scientific symposium entitled Trstenjakovi dnevi “Človek - izobraževanje - človek”, Gornja Radgona, Slovenia, Jan. 27, 2001.

Matjaž Debevc, “Uporaba spletnih video tehnologij za gluhe in naglušne,” a talk at the Teleinfos seminar, Ljubljana, Slovenia, May 16–18, 2001.

Matjaž Debevc, “Nacionalni program e-izobraževanja za gluhe in naglušne,” a talk at the seminar entitled Prihodnost naših organizacij, Fiesa, Slovenia, June 1, 2001.

Matjaž Debevc, “Študij na daljavo in ustanavljanje centrov podpore za razvoj,” a talk at the 2nd World Congress of Slovenian Scientists and Researchers, Maribor, Ptuj, Slovenia, Sept. 20–22, 2001.

Dean Korošec, Matjaž Debevc, “Informacijske tehnologije za študij na daljavo in nove oblike tradicionalnega izobraževanja,” a talk with the colloquium entitled Dnevi računalniškega centra Univerze v Mariboru, Maribor, Slovenia, Oct. 17–19, 2001.

Matjaž Debevc, “Pomen elektronskih učnih gradiv v e-izobraževanju,” panel discussion at the COBISS Conference, Maribor, Slovenia, Nov. 13–14, 2001.

Signal Processing and Remote Control Laboratory AU – 11

SIGNAL PROCESSING AND REMOTE CONTROL LABORATORY

Head:

Assoc. Prof. Dr. Žarko Čučej

Phone: +386 2 220 71 20


RESEARCH PROJECTS


Basic research projects

L2–9072-0796-99 Compression of Two-Dimensional Signals

Leader: Assoc. Prof. Dr. Žarko Čučej Participants: Asst. Prof. Dr. Peter Planinšič; Dr. Jože Mohorko (until June 2001);

Dušan Gleich, MSc; Tomaž Romih; Dr. Bojan Gergič (until October 2001)

Financed by: Ministry of Science and Technology of the Republic of Slovenia (individual research funds, doctoral scholarship)

This research project is an international bilateral research project with the German Aerospace Agency DLR/DFD entitled Compression of Two-Dimensional Signals. This research project started in 1997 and finished successfully in 1999, but further research is still going on. During this year we focused on the image quality of reconstructed images using advanced wavelet coders. We developed new quality measurements based on fuzzy sets and new compression algorithms based on context coding.

We investigated the possibility of replacing the Viterbi algorithm in the trellis quantization using context estimation of surrounding wavelet coefficients. Fuzzy sets were used to predict the subset of the trellis. We developed a probability estimation engine, which also uses fuzzy logic. An arithmetic coder used in the compression scheme is driven using a new probability estimation. We developed a new wavelet-based coder, which uses Space Frequency Quantization and context modeling. It achieves the best results among our developed coders in the rate distortion sense. A primary goal of the investigation focused on the image quality

AU – 12 Signal Processing and Remote Control Laboratory

of the advanced wavelet coders using objective and subjective measurements.

The developed algorithms were tested on Synthetic Aperture Radar data, as well on natural optical images. A comparison was made using such well known methods as SPIHT, SFQ and EZW. Test were performed using IDL, Matlab and Visual C++ programs.

ATM network management and control

Leader: Assoc. Prof. Dr. Žarko Čučej Participant: Mihael Kaiser

Financed by: Signal Processing and Remote Control Laboratory, Ministry of Science and Technology of the Republic of Slovenia (doctoral scholarship)

Research is focused on “smart” management and traffic flow control in input network switches dealing with massive heterogenic traffic. In control area we investigate possibilities and capabilities of the last generation of network processors and languages for the functional description of traffic management tasks.

Quality of Services in (narrowband) Radionetworks

Leader: Assoc. Prof. Dr. Žarko Čučej Participants: Boris Ratej, MSc (Systems and control laboratory, now Ultra Co.);

Assoc. Prof. Dr. Rajko Svečko (Systems and Control Laboratory)

Financed by: Systems and Control Laboratory, ULTRA company, Ministry of Science and Technology of the Republic of Slovenia (doctoral scholarship)

The research goal is the management and control of multipurpose terminals in Radionetworks with narrow bands. Terminals generate heteogenic traffic (data, real-time remotecontrol data, voice). We focuse on the Quality of Service managament with the “smart” control of queue buffers and voice quality achieved with a variable compression rate.

Optimal pulse width modulation – phase 2: hierarchical current controller

Leader: Assoc. Prof. Dr. Žarko Čučej Participants: Assoc. Prof. Dr. Peter Cafuta, Prof. Dr. Bojan Grčar

Financed by: Signal Processing and Remote Control Laboratory

Nowadays hybrid control algorithms enable the introduction of new control strategies, which can replace classical pulse-width modulation in voltage source inverters.

The developed hybrid controller has a prescribed switching order, feedforwarded steering of


voltage pattern selection, as well as tabulated logic rules. It has current error of O(T) type, which has lower average value than the current error of O(T2) type significant for PWM inverter control. Its dynamic is the same as at variable structured control. The theory of such a control has been employed in controller design. We developed and proved the stabilty conditions for the controller.

Industrial project

Heating radiators quality inspection by computer vision

Leader: Assoc. Prof. Dr. Žarko Čučej Participant: Dr. Bojan Gergič

Financed by: Aklimat d.o.o. Lenart

We deveoped and built a system for the final control of heathing radiators for the Aclimat Lenart Company. Hardware consist of two TV cameras, frame grabber, personal computer and printer. Software is developed by use of the LabView program suite.



Geometry parameters adjustment of images on CRT

Leader: Assoc. Prof. Dr. Žarko Čučej Participants: Dr. Jože Mohorko; Tomaž Romih, MSc; Asst. Prof. Dr. Peter

Planinšič

Financed by: Signal Processing and Remote Control laboratory Duration: 2 years

This basic research was conducted on an already finished industrial project for the Elektronika company, Velenje. We focused on three topics in our further investigation: 1. Theoretical background of polinimial methods in pattern-edge modelling for pattern

recognition. 2. Mathematical model for the geometrical distortion of image on the CRT screen. 3. Hybrid optimization algorithm. It was developed from the standard secant method. Its

convergence in the multidimensional case was improved/extend to nonlinear and discontinuous functions by replacing the Jacobian with the “belonging matrix” and by adding logic condition in the algorithm structure.


Industrial projects

Modem for (narrowband) radio networks

Leader: Assoc. Prof. Dr. Žarko Čučej Participants: Martin Pec, Borut Barbarič (Ultra d.o.o.), Asst. Prof. Dr. Peter

Planinšič, Mihael Kaiser

Financed by: Defence Ministry of the Republic of Slovenia Duration: 1 year

We developed and made for the Defence Ministry of the Republic of Slovenia in collaboration with the ULTRA company a zero series of data terminal/modems which enable digitalization of voice, trasmit data over analog radio networks. The modem is also equiped with GPS for the remote tracking of modem position.

Development of services for ATM technology

Leader: Assoc. Prof. Dr. Žarko Čučej Participants: Asst. Prof. Dr. Peter Planinšič, Mihael Kaiser

Financed by: Telekom Slovenia Duration: 2.5 years

This project investigates the technological possibilities of using the ATM (Asynchronous Transfer Mode) in business, university, and medical environments. Emphasis was placed on a market analysis for the introduction of the ATM into these environments by designing a reference model for distance learning services over an ATM network.

This year we conducted further studies on how to introduce ADSL and ATM tehnologies into the distance learning process. Further diploma thesis has been done for this purpose.

PUBLICATIONS

Boris Banjanin, Bojan Gergič, Peter Planinšič, Žarko Čučej, “Entropy-threshold method for best basis selection,” Image vis. comput., Vol. 19, No. 7, pp. 477-484, 2001.

Jože Mohorko, Peter Planinšič, Žarko Čučej, “Fast algorithm for pyramid vector quantization,” IEEE signal process. lett., Vol. 8, No. 4, pp. 103-105, 2001.

Peter Planinšič, Bojan Gergič, Dušan Gleich, Žarko Čučej, “Fuzzy control of subband coded image quality using standard and fuzzy quality measure,” Opt. eng., Vol. 40, No. 8, pp. 1529-1544, 2001.


Dušan Gleich, Peter Planinšič, Bojan Gergič, Žarko Čučej, “Subjective quality of reconstructed images obtained with classical and advanced wavelet coders,” Opt. eng., Vol. 40, No. 10, pp. 2143-2150, 2001.

Mihael Kaiser, Žarko Čučej, “Klasifikacija v hitrih omrežjih: komponente in sistemi,” Inf. MIDEM, Vol. 31, No. 3, pp. 197-204, 2001.


Žarko Čučej, “Gradniki močnostne elektronike: pregled,” Inf. MIDEM, Vol. 31, No. 2, pp. 94-101, 2001.

Dušan Gleich, “Komprimiranje dvodimenzionalnih signalov po metodi drevesa ničel,” Electrotechnical Review, Vol. 68, No. 4, pp. 192-199, 2001.

Peter Planinšič, “Kodiranje in zgoščevanje slik,” Svet elektron., Vol. 8, No. 81, pp. 38-41, 2001.

Peter Planinšič, “Fuzzy iterative methode for root-finding of an monotone nonlinear function,” International summer school of automation, Maribor, Slovenia, June 2001, pp. 109-115.

Peter Planinšič, “Subband coded images quality control using fuzzy logic and neural networks,” Problems in applied mathematics and computational intelligence (Mathematics and computers in science and engineering), World Scientific and Engineering Society Press, pp. 153-158.

Peter Planinšič, “Standard and subjective images quality control of subband coded images using fuzzy logic and neural networks: a tutorial review,” IWSSIP 2001, Bukarešta, Romania, pp. 201-217.

Peter Planinšič, “Subband coded images quality control using fuzzy logic and neural networks,” The WSES international conferences Neural network and applications (NNA 2001), Fuzzy sets and fuzzy systems (FSFS 2001), Evolutionary conputation (EC 2001), Puerto De La Cruz, Tenerife, Spain, Feb. 2001, 6 pp.

Peter Cafuta, Žarko Čučej, Bojan Grčar, “Discrete boundary layer current control for VSI - IM drive,” The IEEE Joint International Conference on Control Applications & International Symposium on Intelligent Control CCA/ISIC '01, México City, Mexico, Sept. 2001, pp. 339-344.


Dušan Gleich, Peter Planinšič, Bojan Gergič, Žarko Čučej, “Context based SAR data compression using fuzzy logic,” The IEEE international geoscience and remote sensing symposium IGARSS 2001, Sydney, Australia, July 2001, 3 pp.

Peter Cafuta, Žarko Čučej, “Mapping and feedforward steering at direct current switching control of VSI feeding IM,” 9th Mediterranean conference on control and automation, Dubrovnik, Croatia, June 2001.

Peter Planinšič, Dušan Gleich, Bojan Gergič, Žarko Čučej, “A simple design of wavelet-subband image coder,” 3rd International symposium on Video processing and multimedia communications VIPromCom 2001, Zadar, Croatia, June 2001, pp. 245-249.

CONGRESSES, MEETINGS, AND COMMITTEES

Asst. Prof. Dr. Peter Planinšič: Member of organizing committee for conference “Automatization of industry”, Maribor, Slovenia, April 5–6, 2001.

Assoc. Prof. Dr. Žarko Čučej: Member of International program committee of international workshop IWSSIP 2001, Bucharest, Romania, June 7–12, 2001.

Asst. Prof. Dr. Peter Planinšič: Member of local organizing committee for ICEEPUS international summer school, Maribor, Slovenia, June 10–22, 2001.

Assoc. Prof. Dr. Žarko Čučej: Member of International program committee of international conference ViProCom 2001, Zadar, Croatia, June 12–15, 2001.

Assoc. Prof. Dr. Žarko Čučej: Member of International program committee of international conference Elmar 2001, Zadar, Croatia, June 12–15, 2001.

VISITS TO OTHER INSTITUTIONS

Asst. Prof. Dr. Peter Planinšič, Dušan Gleich, MSc:

Information days for 5th European framework: ITS Integrated Machine Vision Europe 2001, Budapest, Hungary, Jan. 29–30, 2001.


Assoc. Prof. Dr. Žarko Čučej, Mihael Kaiser:

Scientific collaboration in development of cable communication systems at the Faculty of Electrical and Computer Engineering Zagreb, Croatia, May 2001.

AU – 18 Process Automation Laboratory

PROCESS AUTOMATION LABORATORY

Head:

Assoc. Prof. Dr. Boris Tovornik

Phone: +386 2 220 71 60


RESEARCH PROJECTS


Applied projects

L2-3436-0796 Mehko krmiljenje digitalnih varilnih izvorov za MIG/MAG elektroobločna postopka varjenja (Digital Fuzzy Welding Control in MIG/MAG Gas Metal Arc Welding)

Leader: Dr. Marjan Golob Participants: Assoc. Prof. Dr. Boris Tovornik; Asst. Prof. Dr. Nenad Muškinja; Dr.

Marjan Golob; Aleksander Polutnik, MSc; Stojan Peršin; Alojz Hojnik; Miloš Vute

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia and Varstroj d.d., Lendava

Welding is an important manufacturing process that can be automated. Its effect on the quality of products is particularly important when new materials are used in the manufacturing process. The permanent demand for higher quality products at lower product prices dictates a permanent development of production quality assurance methods and systems. Super-control of welded products (destructive and non-destructive testing of welds) is time consuming and expensive, so new possibilities are being investigated for fully automated welding processes. One of the feasible possibilities in this domain is to design an intelligent controller for welding sources. This controller offers parameter settings (welding energy, pulse shapes) with respect to the chosen material, weld characteristics and welding program. This is made possible by a decision system based on analysis of feedback information coming from the welding process and the knowledge database decision algorithm, supported by intelligent data analysis, neural network theory and a fuzzy decision system is able to adjust automatically the welding parameters of automated welding cells in order to fulfil the

Process Automation Laboratory AU – 19

desired technological requirements. The control and regulation of the welding process is implemented depending on the conditions in the solidified weld which is in direct connection with the quality of the welded joint. This project will combine the results of interdisciplinary research work performed by experts in welding technology, measurements of electrical and physical quantities, intelligent data analysis, soft computing technologies, and microprocessor technologies.

Inteligentna hiša (Intelligent House)

Leader: Assoc. Prof. Dr. Boris Tovornik Participants: Stojan Peršin; Asst. Prof. Dr. Nenad Muškinja; Dr. Marjan Golob;

Aleksander Polutnik, MSc; Alojz Hojnik

Financed by: personal research founds

Purpose of this project is the development of the Intelligent House, where the most important systems needed in up-to date buildings are integrated: security, fire prevention, heat, ventilation and air-conditioning systems, lighting, power management and other devices. The LonWorks system was used which is, at the moment one, of the most used technologies in the area of home and building automation. The key part of this technology is a LonWorks control network based on equal nodes. The model of a smart home was made using this technology. It has two rooms and a basement where every room represents a node. The basic components of LonWorks technology: Neuron, transceiver for communication on network, I/O driver with surroundings, and a control network with LonTalk protocol are used in the model.


CEEPUS – CZ 103 CEEPUS – project

Leader: Assoc. Prof. Dr. Boris Tovornik

Financed by: CEEPUS

Project purpose is student and professor exchanges within the Middle and Eastern Europe region, organisation of international summer schools and co-ordination of proposals for common research projects.

The “International summer school of automation” was held at the Faculty of Electrical Engineering and Computer Science, University of Maribor, June 10–22, 2001. There was collaboration between 25 delegates.

Within the CEEPUS CZ-103 project the Faculty of Electrical Engineering and Computer Science, University of Maribor organised the summer school “International summer school of


automation”, on June 10–22, 2001 in Maribor, Slovenia. The summer school evoked wide interest and was attended by 25 professors and students included members of the TU Prague, TU Bratislava, TU Brno, TU Plovdiv, TU Gabrovo, UNI Zagreb, UNI Split, and from UNI Maribor. Two interesting visits ware made during the summer school to the Iskroemeco factory in Kranj and to the brewing industry in Pivovarno Laško. The summer school received wide coverage in the Slovenian mass media and some of its participants were interviewed by local newspapers, radio and television. Split, Croatia is the host city for the next 2002 international summer school.


Industrial project

55-3512 Trifazni gospodinjski števec MT330 z LON komunikacijo(Three-phase Energy Power Counter MT330 with integrated LON communication)

Leader: Assoc. Prof. Dr. Boris Tovornik Participants: Asst. Prof. Dr. Nenad Muškinja; Dr. Marjan Golob; Aleksander

Polutnik, MSc; Stojan Peršin; Alojz Hojnik; Primož Žerdin

Financed by: Ministry of Eductaion, Science and Sport of the Republic of Slovenia and Iskra Emeco Kranj

Duration: July 2000 to December 2001

Purpose of this project was the development of a Three-phase Energy Power Counter MT330 with an integrated tariff device, real-time clock, data processing and saving, external power consumer control possibility and LON communication. A LON.dll library was included in the CATS control software package for controlling and testing the MT330 power counters in the production phase. Project enable hardware and software changes during realisation. The modular structure of the MT330 power counter enables one or three phase counters with the possiblility of one or two tariffs. The LON.dll library includes: Command, SetData, ReadData ReadSelfDoc, LonInit, LonClose, init (Initialisation of an ActiveX IELON), close (Removing the ActiveX IELON) and ReadNV (Read Netvork Variables) functions.

PUBLICATIONS

Aleksander Polutnik, Boris Tovornik, Miha Urbanija, “Razvoj mikroprocesorskega senzorja nivoja z uporabo programske opreme LabView,” Electrotechnical Review, Vol. 68, No. 1, pp. 51-56, 2001.


Darjan Gradišnik, Nenad Muškinja, “Kako pristopiti k posodobitvi stroja,” ER, Vol. 2, No. 3, pp. 15-16, 2001.

Stojan Peršin, Božidar Bratina, Boris Tovornik, “Uporaba OPC v sistemih avtomatizacije,” Avtomatika, Vol. 3, No. 14, pp. 22-25, 2001.

Stojan Peršin, Boris Tovornik, “Bluetooth kot univerzalni vmesnik,” Avtomatika, Vol. 3, No. 17, pp. 59-61, 2001.

Stojan Peršin, Boris Tovornik, “Sodobni sistemi hišne avtomatizacije,” EGES, Energ. gospod. ekol. Slov., Vol. 5, No. 5, pp. 92-96, Nov. – Dec. 2001.

Stojan Peršin, Boris Tovornik, “Zasnova inteligentne hiše ter primer izvedbe,” Svet elektron., Vol. 8, No. 78, pp. 18-22, 2001.

Ladislav Mikola, Marjan Golob, Meritve: merilne metode in laboratorijske vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Stojan Peršin, Boris Tovornik, “Intelligent buildings,” International summer school of automation, Maribor, Slovenia, June 2001, pp. 75-82.

Aleksander Polutnik, Martin Pec, “Automatic vehicle location unit with simultaneous voice and data communication on GSM data channel,” International summer school of automation, Maribor, Slovenia, June 2001, pp. 36-39.

Bogdan Pavlič, Aleksander Polutnik, “System for payment data exchange and payment terminal device used therein: PTC Request ... that the present international application be processed according to the Patent Cooperation Treaty,” München, Germany.

Stojan Peršin, Boris Tovornik, “Fault detection and diagnosis methods in HVAC building automation systems using industrial solutions,” The 2nd International PhD student workshop on systems and control, Balatonfüred, Hungary, Sept. 2001, pp. 26-30.

Marjan Golob, Boris Tovornik, “PID and fuzzy control of a magnetic suspension system,” 9th Mediterranean conference on control and automation, Dubrovnik, Croatia, June 2001.

Nenad Muškinja, Boris Tovornik, “Adaptive state controller for inverted pendulum,” 9th Mediterranean conference on control and automation, Dubrovnik, Croatia, June 2001.

Stojan Peršin, Drago Valh, Boris Tovornik, “Fault detection and isolation methods applied in a chemical process,” The Sixteenth Dubrovnik International Course and Conference on the


Interfaces among Mathematics, Chemistry and Computer Sciences MATH/CHEM//COMP 2001, Dubrovnik, Croatia, June 2001, pp. 69.

Boris Tovornik, Drago Valh, “Safety problems in process industry,” Manufacturing systems for the third millenium, Maribor, Slovenia, pp. 177-199.

Stojan Peršin, Božo Bratina, Boris Tovornik, “OPC vmesnik v sistemih procesnega vodenja,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 221-224.

Stojan Peršin, Boris Tovornik, “Sistemi vodenja v pametnih zgradbah,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 237-240.

Miha Erklavec, Stojan Peršin, “Internet v vsakdanjem življenju,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 226-228.

Ivan Glavač, Stojan Peršin, “Avtomatizacija postopka termične obdelave hlodovine,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 23-25.

Marjan Golob, Arpad Köveš, Aleš Puklavec, Boris Tovornik, Bojan Novak, “Modeliranje, simulacija in mehko vodenje varilnih postopkov GMAW,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 52-59.

Darjan Gradišnik, Nenad Muškinja, “Kako pristopiti k posodobitvi stroja?” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 60-62.

Janez Klemenčič, Stojan Peršin, “Avtomatizacija linije za avtomatsko skobljenje lesa,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 26-28.

Stojan Peršin, Boris Tovornik, “Inteligentne zgradbe ter model inteligentne hiše z LonWorks omrežjem,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 40-44.

Stojan Peršin, Boris Tovornik, Gorazd Lešnjak, “Statistical Process Control (SPC),” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 45-51.


Boris Turk, Aleksander Polutnik, “Avtomatizacija zajemanja, prenosa in obdelave podatkov na bencinskih servisih,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 177-180.

Stojan Peršin, Boris Tovornik, “Sistemi tehničnega upravljanja zgradb od centralnih nadzornih sistemov do sistema inteligentnih zgradb,” Osmo strokovno posvetovanje Inteligentne zgradbe, Ljubljana, Slovenia, Oct. 2001, pp. 17-23.


Assoc. Prof. Dr. Boris Tovornik, Asst. Prof. Dr. Nenad Muškinja, Dr. Marjan Golob, Stojan Peršin, Alojz Hojnik:

Organisation of the International Summer School “International summer school of automation”, Maribor, Slovenia, June 10–22, 2001.

Assoc. Prof. Dr. Boris Tovornik, Asst. Prof. Dr. Nenad Muškinja, Dr. Marjan Golob, Stojan Peršin, Alojz Hojnik:

Organisation of the conference “Automation in Industry and Economy”, Maribor, Slovenia, April 5-6, 2001.

Assoc. Prof. Dr. Boris Tovornik: Member of international program committee at “9th Mediterranean Conference on Control and Automatio”, Dubrovnik, Croatia, June 27–29, 2001.

Stojan Peršin: Co-organisation of the expert consultation “Intelligent buildings”, Ljubljana, Slovenia, Oct. 2, 2001.


Assoc. Prof. Dr. Boris Tovornik: Faculty collaborations, University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia: several visits.

GUESTS AND VISITORS

Prof. Dr. Mikulaš Huba and Lectures at the “International summer school of


Pavol Bistak (TU Bratislava, Slovakia), Miroslav Dub, Waszinovski Libor, and Pavel Burget (TU Prague, Czech Republic) Prof. Dr. František Šolc, Prof. Dr. František Zezulka, and Sona Orlikova (TU Brno Czech Republic), Prof. Dr. Ivan Ganchev (TU Plovdiv, Bolgaria), Prof. Dr. Hristo Hristov, and Božidar Kirshev (TU Gabrovo, Bolgaria), Prof. Dr. Maja Bozanić, Prof. Dr. Mirjana Bonkovič, Slavomir Stankov, and Marko Rosić (University of Split, Croatia), Prof. Dr. Zoran Vukić, Prof. Dr. Nedeljko Perić, Prof. Dr. Ivan Petrović, Prof. Dr. Željko Ban, and Nenad Bolf (University of Zagreb, Croatia):

automation”, Maribor, Slovenia, June 10–22, 2001.

DECORATIONS, AWARDS, AND HONOURS

Tomislav Klančnik, mentor Assoc. Prof. Dr. Boris Tovornik, Prof. Bedjanič Award for the BSc work.

Measurements Laboratory AU – 25

MEASUREMENTS LABORATORY

Acting Head:

Assoc. Prof. Dr. Vojko Matko

Phone: +386 2 220 71 11


RESEARCH PROJECTS



Comparison of Measurement of Object Position using GPS Signals and Various Databases

Leader: Assoc. Prof. Dr. Vojko Matko

Financed by: personal research funds

The aim of this project is to compare the measurement of object position using various databases such as “Jeppersen”, “Autoroute”, “Atlas Slovenije” and various GPS signal receivers.

Position measurement using digitally coded satellite signals.

AU – 26 Measurements Laboratory

The moving object has no fixed reference point and does not transmit any signals. With the correlation measurement of digitally coded mutually delayed satellite signals it is possible to determine position, velocity and direction of movement, and to predict the position of an object in space coordinates after a certain time. The use of various databases provides a more complex picture of any error occurring in such position measurement. The goal of this research is to determine the GPS system measurement uncertainty for measurements in Slovenia.

Applied projects

Measuring via LAN Network and Internet

Leader: Assoc. Prof. Dr. Vojko Matko Participants: Bojan Alatič, MSc; Dr. Bojan Gergič

Financed by: programme research funds

This projects aims to define the procedures and appropriate software tools for web- and LAN network-based measuring in real time. Under development are the receiving and transmitting measurement data communicator with the option of remote on/off switching of the measurement system and of the individual functions via Internet. The minimal LAN and Internet network occupancy possibilities and the suitability of the measuring systems for such measurement will be studied. The definition of the above procedures would result in a wider application for industry and research.

Temperature Stabilization of Quartz Oscillator above the Serial Resonant Frequency Range


Financed by: personal research funds

The goal of this project is to stabilize the oscillation frequency of a quartz oscillator above the serial resonant frequency. In this area the crystal can be used as a very sensible element for measuring non-electric quantities. Added reactance of –1/jwc causes increased temperature instability. It is anticipated that with temperature stabilization the measuring uncertainty could be reduced by multiples of 100, which is also the aim of this project. The solution to the above problem opens completely new measurement areas in measuring techniques.


Research and development project

Computer Network Development for the Laboratory

Leader: Assoc. Prof. Dr. Vojko Matko Participants: Dr. Bojan Gergič; Ladislav Mikola, MSc; Miloš Vute; Stanko Lampič

Financed by: program research funds

The aim of this project is to develop a computer network for a modern measurements laboratory. The competitiveness of production largely depends on on-time and accurate information during the production process, including measurements and quality control. Given the ever increasing importance of Internet communication, this project aims to develop the communications infrastructure as well as automated measurement procedures and product quality control procedures which will be based on the connection of virtual instruments on the Internet. The knowledge gained shall be passed on to the students, reaserchers and industry in the framework of laboratory exercises, research projects and diploma theses.

Industrial project

Measuring Resistance of Materials that can Accumullate the Electric Charge

Leader: Ladislav Mikola, MSc Participants: Miloš Vute, Stanko Lampič

Financed by: Konus Konex d.d.o.

The aim of this projects is to measure the Ohm resistance (high values as a rule), which represents important information on electrostatic material property. The latter is particularly important where the electrostatic discharges represent a significant danger, i.e. particularly the risk of explosion in the environment, e.g. of gases. Such materials can be floorings, textiles, shoe soles, etc. Those measuring procedures are standardized, however, the measuring results have low repeatability, which is mainly due to the order of magnitude of resistance, test material specific properties and temperature. This project measures the resistance of the filter material with in-built conducting fibres. To this end, corresponding measurement tools were developed in line with the standards in the laboratory. The composition and form of the material that shall meet the standards shall be determined in consultation with the client.




3D Distance Measurement of a Moving Object Using Non-Stationary Satellite Signals


Financed by: personal research funds Duration: 2 years

The moving object has no fixed reference point. When moving along coordinates x, y, z (with optional velocity) its longitudinal and transverse axis and acceleration may change. With satellite signals it is possible to determine distances in all directions, speed of movement, direction and to predict an object's position in 1 minute, 10 minutes or 1 hour. The measuring range from one point to another is up to 500 km.


Pile Bearing Capacity

Leader: Andrej Štrukelj, MSc Participants: Dr. Gorazd Lipnik; Boštjan Kovačič, MSc

Financed by: DARS Duration: 2 years

On soft soil the bridge pier’s foundation has to be additionally reinforced using piles. Depending largely on local conditions, the pile bearing capacity can only be predetermined by field tests on-sight. It is very difficult for designers to predict precisely the pile bearing capacity per coat or at the foundation. As a result, a special measuring procedure for pile load testing was developed and carried out in close cooperation between the Electric Measurements Laboratory and Faculty of Civil Engineering. These type of measurements offer a revolutionary approach to inspecting the quality of construction. Prior to measurements, a special system was designed for inserting the probe into the pile. A special program was also developed for displacement and force monitoring over a longer period of time and simultaneous evaluation of force distribution with the depth. During the progressive increase of load up to 1,200 tons, relative extensions up to the depth of 15 metres were closely controlled at every metre. At the same time the pile displacements and the condition of the supporting construction were observed. The measurements clearly showed the behaviour of the pile up to the maximum load that can be imposed onto the soil supporting the pile foundation.


Industrial project

Load Testing

Leader: Andrej Štrukelj, MSc Participants: Dr. Gorazd Lipnik; Boštjan Kovačič, MSc

Financed by: DARS, CMC Celje Duration: 2 years

In close cooperation with the Faculty of Civil Engineering, a laser geodetic measuring system for dynamic controlling of large object vertical displacements was developed in the Measurements Laboratory. A software package for communication and sensor control according to a serial communication port in the Windows environment was developed for the NIKON measuring sensors. Also, a special mobile system for roadway irregularity analysis and a system for dynamic controlling of forces in large objects over long periods with the possibility of regenerating the programs and data in the event of possible power loss.

PUBLICATIONS

Boris Banjanin, Bojan Gergič, Peter Planinšič, Žarko Čučej, “Entropy-threshold method for best basis selection,” Image vis. comput., Vol. 19, No. 7, pp. 477-484, 2001.

Dušan Gleich, Peter Planinšič, Bojan Gergič, Žarko Čučej, “Subjective quality of reconstructed images obtained with classical and advanced wavelet coders,” Opt. eng., Vol. 40, No. 10, pp. 2143-2150, 2001.

Peter Planinšič, Bojan Gergič, Dušan Gleich, Žarko Čučej, “Fuzzy control of subband coded image quality using standard and fuzzy quality measure,” Opt. eng., Vol. 40, No. 8, pp. 1529-1544, 2001.

Jože Mohorko, Ladislav Mikola, “Adaptivna metoda merjenja statičnih karakteristik elektronskih komponent in njena realizacija z virtualnim instrumentom,” Inf. MIDEM, Vol. 31, No. 3, pp. 178-184, 2001.

Ladislav Mikola, Marjan Golob, Meritve: merilne metode in laboratorijske vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Vojko Matko, Merilna negotovost I: postopek ugotavljanja merilne negotovosti pri analognih merilnih vezjih. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.


Vojko Matko, Računalnške simulacije v preizkusni tehniki: primeri simulacijskih vaj: navodila za uporabo analiz. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Vojko Matko, Jože Koprivnikar, Analize in sinteze rezultatov v preizkusni tehniki: laboratorijske vaje za program elektrotehnike. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science, Inštitut za avtomatiko 2001.

Dušan Gleich, Peter Planinšič, Bojan Gergič, Žarko Čučej, “Context based SAR data compression using fuzzy logic,” The IEEE international geoscience and remote sensing symposium IGARSS 2001, Sydney, Australia, July 2001, 3 pp.

Gorazd Lipnik, Boštjan Kovačič, Vojko Matko, “Computer based dynamic measurements of displacements on bridges,” The first ISA/IEEE Sensors for Industry Conference, Rosemont, USA, Nov. 2001, pp. 142-144.

Gorazd Lipnik, Andrej Štrukelj, Vojko Matko, “Dynamic road surface measurements on bridges,” The first ISA/IEEE Sensors for Industry Conference, Rosemont, USA, Nov. 2001, pp. 145-148.

Gorazd Lipnik, Boštjan Kovačič, Petra Šparl, “Computer monitoring of load test on piles,” The eighth International Conference on Civil and Structural Engineering Computing, Eisenstadt, Austria, Sept. 2001, pp. 287-288.

Gorazd Lipnik, Vojko Matko, “Monitoring of the heat transfer in buildings,” International Workshop on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications, IDAACS 2001, Foros, Ukraine, July 2001, pp. 178-180.

Gorazd Lipnik, Vojko Matko, Darja Lipnik, “Ovrednotenje optimiranja merilne proge z metodo Monte Carlo,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 545-548.

Peter Planinšič, Dušan Gleich, Bojan Gergič, Žarko Čučej, “A simple design of wavelet-subband image coder,” 3rd International symposium on Video processing and multimedia communications VIPromCom 2001, Zadar, Croatia, June 2001, pp. 245-249.

Gorazd Lipnik, “Optimiranje kompleksnih merilnih sistemov na osnovi merilne negotovosti,” 2. letna konferenca SILAB, Ljubljana, Slovenia, 11 pp.



Assoc. Prof. Dr. Vojko Matko, Ladislav Mikola, MSc:

TCL, Velenje, Slovenia.

Assoc. Prof. Dr. Vojko Matko: Prevent, Slovenj Gradec, Slovenia.

Assoc. Prof. Dr. Vojko Matko: Global Vision, Ljubljana, Slovenia.

Assoc. Prof. Dr. Vojko Matko: Technological Institute, Ljubljana, Slovenia.

Assoc. Prof. Dr. Vojko Matko: Electrotechnical college, Velenje, Slovenia.

Assoc. Prof. Dr. Vojko Matko: Acroni, Jesenice, Slovenia.

Dr. Bojan Gergič: National instruments Slovenia, Celje, Slovenia.

GUESTS AND VISITORS

Dr. Franc Seme, Emil Jeromel, Bojan Skrt (TCL, Velenje, Slovenia):

Discussion on business.

Jože Kozmus (Prevent, Slovenj Gradec, Slovenia):


Prof. Dr. Anton Jeglič (Faculty of Electrical Engineering, Ljubljana, Slovenia):

Scientific discussion.

Prof. Dr. Mladen Boršič (Faculty of Electrical Engineering, Zagreb, Croatia):

Scientific discussion.

Jožef Tomažič (Slovenian Railways, Ljubljana):


AU – 32 Laboratory for Electro-Optics and Sensor Systems

LABORATORY FOR ELECTRO-OPTICS AND SENSOR SYSTEMS

Head:

Prof. Emeritus Dr. Dali Ðonlagić

Phone: +386 2 220 71 10


RESEARCH PROJECTS



J2-1262-0796-99 Akustični in optični vlakenski senzorji (Acoustics and Fibre Optics Sensors)

Leader: Asst. Prof. Dr. Denis Đonlagić Participant: Edvard Cibula

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia

The goal of this project is to research the applicability of acoustical and optical physical principles in the metrology area. We are also developing sensor prototypes. Fluid level measurement using the acoustical resonance principle showed sound characteristics in an industrial environment, where dust, foam and sediments are usually present in measurement tanks. Optical fibre sensors experienced fast responses due to their universality and great sensitivity. In this cases we developed temperature and fluid level sensors, industrial and medical pressure sensors, WIM sensor etc.

PUBLICATIONS

Franc Eferl, Denis Ðonlagić, “Postopek in priprava za dopolnilno formiranje sekundarne baterije in postopek in priprava za hitro polnjenje dopolnilno formirane sekundarne baterije,” A Patent, Publication No. 20601, Request No. 200000130, Ljubljana, Urad Republike Slovenije za intelektualno lastnino, Dec. 31, 2001.

Laboratory for Electro-Optics and Sensor Systems AU – 33

Denis Ðonlagić, “Fiber optic sensors: an introduction and overwiew,” International summer school of automation, Maribor, Slovenia, June 2001, pp. 40-51.

Edvard Cibula, Denis Ðonlagić, “Miniaturni optični vlakenski merilnik tlaka za medicinske aplikacije,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 85-88.

Irvin Sirotić, Denis Ðonlagić, “Uravnovešanje optičnih vlakenskih interferometrov,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 81-84.

Edvard Cibula, Denis Ðonlagić, “Termično skaniranje nizkokoherenčnih vlakenski interferometrov,” ruga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 311-314.

Irvin Sirotić, Denis Ðonlagić, “Sistem za precizno uravnovešanje optičnih vlakenskih interferometrov,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 306-310.


Asst. Prof. Dr. Denis Đonlagić: Postdoctoral work in Corning Inc., USA.

Institute of Electronics EL – 1

INSTITUTE OF ELECTRONICS

Head:

Prof. Dr. Bogomir Horvat

Phone: +386 2 220 72 00


URL: http://www.elektronika.uni-mb.si

The Institute of Electronics has more than 30 employees including 1 full professor, 4 associate professors, 3 assistant professors, assistants, researchers, and technical staff. The main activities of the Institute of Electronics are teaching graduate and postgraduate courses and research. Research is currently focused on one fundamental research project, which is financed by the Ministry of School, Science and Sport of the Republic of Slovenia, projects with local industry, six international projects and projects with foreign industry partners.

In 2001, the Institute of Electronics staff published 127 papers presenting the findings of its research, organised meetings and conferences, and visited several institutes. The primary areas of study at the Institute of Electronics are speech recognition, language technology, multimedia systems, electronic circuits, digital filters, microcomputer structures, formal verification of distributed systems, and digital signal processing.

EL – 2 Institute of Electronics

Members of the Institute of Electronics are organised into four laboratories and two centres of technology.

Digital and Information Systems Laboratory


Employees: Assoc. Prof. Dr. Marko Jagodič; Asst. Prof. Dr. Mitja Solar; Janez Stergar, MSc; Rado Slatinek, MSc; Iztok Kramberger, MSc; Andrej Žgank, Univ. Dipl. Ing.; Tomaž Rotovnik, BSc; Damjan Vlaj, BSc; Aleksandra Zögling Markuš, Ing.

Digital Information Systems

Laboratory Head:


Electronics Systems

Laboratory Head:

Asst. Prof. Dr. Rudolf Babič

Microcomputer Systems

Laboratory Head:


Digital Signal Processing Laboratory

Head: Assoc. Prof. Dr. Zdravko Kačič

Institute of Electronics Head:


Institute of Electronics EL – 3

Microcomputer Systems Laboratory

Head: Assoc. Prof. Dr. Zmago Brezočnik

Employees: Assoc. Prof. Dr. Tatjana Kapus; Bogdan Dugonik, MSc; Aleš Časar, MSc; Filip Samo Balan, MSc; Andrej Kruščič, BSc; Robert Meolic, MSc; Boštjan Vlaovič, BSc; Peter Vicman, BSc; Aleksander Vreže, BSc

Digital Signal Processing Laboratory


Employees: Dr. Mirjam Sepesy Maučec; Matej Rojc, MSc; Marcel Ogner, Ing.; Srečko Grašič, BSc; Vladimir Hozjan, BSc; Bojan Kotnik, BSc; Robert Veronik, BSc; Daniel Čeh Ambruš, BSc

Centre for Language Technologies


Electronic Systems Laboratory

Head: Asst. Prof. Dr. Rudolf Babič

Employees: Asst. Prof. Dr. Tomaž Dogša; Asst. Prof. Dr. Franc Jurkovič; Gerhard Angleitner, MSc; Bojan Jarc, MSc; Matej Šalamon, MSc; Davorin Osebik, MSc; Branko Drevenšek, BSc; Anton Vesenjak, Ing.

Centre for Verification and Validation of Systems

Head: Asst. Prof. Dr. Tomaž Dogša

EL – 4 Digital and Information Systems Laboratory

DIGITAL AND INFORMATION SYSTEMS LABORATORY

Head:


Phone: +386 2 220 72 00


RESEARCH PROJECTS


Applied projects

Telephone Speech database POLIDAT

Leader: Prof. Dr. Bogomir Horvat Participants: Assoc. Prof. Dr. Zdravko Kačič; Matej Rojc, MSc; Aleksandra

Zögling Markuš, Robert Veronik

Financed by: internal research funds

The goal of this project is to create speech databases recorded over fixed and mobile telephone networks that will be used for development and testing of real life automatic telephone speech dialog systems. Databases will have good coverage of applications, languages, speaking styles, and different environments. These databases will contain the voices of 1000 speakers recorded over fixed and mobile phones.

K-981.0 Software for automatic speech recognition

Leader: Prof. Dr. Bogomir Horvat Participants: Assoc. Prof. Dr. Zdravko Kačič; Matej Rojc, MSc; Janez Stergar,

MSc; Damjan Vlaj; Bojan Kotnik

Financed by: Corporate Research Laboratories of SIEMENS

The goal of the project is development of software for automatic speech recognition and speech synthesis. This tasks encompasses speech pre-processing, feature extraction and

Digital and Information Systems Laboratory EL – 5

acoustic modelling for automatic speech recognition and development of a multilingual text- to-speech synthesis system. Application domains: telecommunication systems, office automation.

International projects

Multilingual text-to-speech synthesiser

Leader: Prof. Dr. Bogomir Horvat Participants: Assoc. Prof. Dr. Zdravko Kačič; Janez Stergar, MSc; Matej Rojc,

MSc; Vladimir Hozjan; Bojan Kotnik; Damjan Vlaj Partners: University of Maribor, Siemens


The goal of this project is to gain new knowledge and experiences in the field of multilingual text-to-speech processing. The main area of the proposed research work will be the analyses of language-independent methods used for linguistic and acoustic processing in the framework of text-to-speech systems. Architecture of a language independent text-to-speech system and the use of the most appropriate text coding scheme will be analysed. Criteria for the definition of a database of speech synthesis elements will be defined. Also, required language resources for linguistic-level analysis will be defined (lexica, dictionaries) and methods for handling out-of-vocabulary words will be developed.

Prosodic analysis of speech.


Further research will be carried out on the field of the prosodic analysis of text and text tagging. Within this project framework, an automatic text-to-speech system for the Slovenian and German languages will be developed.

Evaluation of multilingual speech resources and tools

Leader: Prof. Dr. Bogomir Horvat Participants: Assoc. Prof. Dr. Zdravko Kačič; Dr. Mirjam Sepesy Maučec; Matej

Rojc, MSc; Janez Stergar, MSc; Vladimir Hozjan, Andrej Žgank, Tomaž Rotovnik, Bojan Kotnik, Damjan Vlaj

Partners: University of Maribor, UPC

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, Ministry of External Affairs of Spain

The goal of the project is to gain new knowledge and experiences in the field of multilingual spoken language resources and automatic speech recognition. The focus of the proposed cooperation is the analysis and evaluation of language resources and methods for acoustic–phonetic modelling. This research also includes methods of language modelling based on independent language approach, i.e. statistical language modelling. The experimental work is based on the use of SpeechDat databases for Spanish and Slovenian languages.

Language Technologies in Communication

Leader: Prof. Dr. Bogomir Horvat Participants: Assoc. Prof. Dr. Zdravko Kačič; Janez Stergar, MSc; Matej Rojc,

MSc; Dr. Mirjam Sepesy Maučec Partners: University of Maribor, University of Zagreb


This research work encompasses the analysis of psychological and communication factors that influence person to person and person to machine speech communication. We will perform an analysis of the target application domains of speech technology (query services, transaction services, office automation etc.) and will specify the critical factors of each application domain.

PUBLICATIONS

Tomaž Javornik, Gorazd Kandus, “An adaptive rate communication system basde on the N-MSK modulation technique,” IEICE trans. commun., Vol. E84-B, pp. 2946-2955, 2001.


Mihael Mohorčič, Markus Werner, Aleš Švigelj, Gorazd Kandus, “Alternate link routing for traffic engineering in packet-oriented ISL networks,” Int. j. satell. commun., Vol. 19, pp. 463-480, 2001.

Roman Novak, Jože Rugelj, Gorazd Kandus, “A note on distributed multicast routing in point-to-point networks,” Comput. oper. res., Vol. 28, pp. 1149-1164, 2001.

Denis Trček, Roman Novak, Gorazd Kandus, Marjan Sušelj, “Slovene smart card and IP based health-care information system infrastructure,” International journal of medical informatics, Vol. 61, pp. 33-43, 2001.

Davorin Osebik, Rudolf Babič, Bogomir Horvat, “Adaptivna digitalna sita v strukturi porazdeljene aritmetike,” Inf. MIDEM, Vol. 31, No. 3, pp. 160-168, 2001.

Bojan Kotnik, Tomaž Rotovnik, Zdravko Kačič, Bogomir Horvat, Boštjan Horvat, Iztok Kramberger, “Zasnova mobilne multimodalne komunikacijske naprave - osebni navigator,” Inf. MIDEM, Vol. 31, No. 1, pp. 39-47, 2001.

Daniel Čeh-Ambruš, Iztok Kramberger, Zdravko Kačič, “Razvoj razširitvene kartice s signalnim procesorjem za PCI vodilo,” Inf. MIDEM, Vol. 31, No. 1, pp. 48-52, 2001.

Srečo Plevel, Tomaž Javornik, Igor Ozimek, Roman Trobec, Gorazd Kandus, “Viterbijev algoritem za DSP procesorje,” Inf. MIDEM, Vol. 31, No. 1, pp. 33-38, 2001.

Uroš Drčić, Mihael Mohorčič, Gorazd Kandus, “Dodeljevanje kanalov v mobilnih komunikacijskih sistemih,” Electrotechnical Review, Vol. 68, No. 1, pp. 20-26, 2001.

Vladimir Hozjan, Zdravko Kačič, Bogomir Horvat, “Analiza prozodičnih značilk govora za modeliranje emocij,” Electrotechnical Review, Vol. 68, No. 4, pp. 213-218, 2001.

Damjan Vlaj, Zdravko Kačič, Bogomir Horvat, “Odstranjevanje šumnih značilk pri avtomatskem razpoznavanju govora,” Electrotechnical Review, Vol. 68, No. 4, pp. 220-224, 2001.

Bogomir Horvat, “Human flow across national boundaries,” Informatologia, Vol. 34, No. 1-2, pp. 46-49, 2001.

Bogomir Horvat, “Multilingual society,” Informatologia, Vol. 34, No. 3-4, pp. 221-223, 2001.

Bojan Kotnik, Tomaž Rotovnik, “Mobilna multimodalna komunikacijska naprava - osebni navigator,” Svet elektron., Vol. 8, No. 75, pp. 28-35, 2001.

Iztok Kramberger, “Pentium IV,” Softw. power, No. 92, pp. 6, 2001.


Iztok Kramberger, “Kontrola iger na sodoben način,” Softw. power, No. 92, pp. 10-15, 2001.

Iztok Kramberger, “Osebna zabava v digitalnem stilu,” Softw. power, No. 92, pp. 16-17, 2001.

Iztok Kramberger, “Mini organizator,” Softw. power, No. 92, pp. 19, 2001.

Iztok Kramberger, “Od pločevine do parnega stroja,” Softw. power, No. 93, pp. 12-14, 2001.

Iztok Kramberger, “AMD ali Intel, to je sedaj vprašanje,” Softw. power, No. 93, pp. 20-21, 2001.

Iztok Kramberger, “Vaš telefon bo primarno podatkovna naprava in ne le zvočni nosilec,” Softw. power, No. 93, pp. 74-75, 2001.

Iztok Kramberger, “LG Flatron v 19 palčni diagonali,” Softw. power, No. 94, pp. 21, 2001.

Iztok Kramberger, “V stilu Motorole,” Softw. power, No. 94, pp. 74-75, 2001.

Iztok Kramberger, “Najboljše od najboljšega,” Softw. power, No. 95, pp. 10-15, 2001.

Iztok Kramberger, “Igra in glasba v stilu teatra,” Softw. power, No. 95, pp. 20-21, 2001.

Iztok Kramberger, “GeForce3 - velik tehnološki korak,” Softw. power, No. 95, pp. 22-23, 2001.

Iztok Kramberger, “ADSL - sodobnejši dostop do interneta,” Softw. power, No. 95, pp. 29, 2001.

Iztok Kramberger, “Siemens za vsak žep,” Softw. power, No. 95, pp. 74-75, 2001.

Iztok Kramberger, “Učinkovitost za zmerno ceno,” Softw. power, No. 96, pp. 10-14, 2001.

Iztok Kramberger, “Windows XP: na poti k .NET,” Softw. power, No. 96, pp. 22-23, 2001.

Iztok Kramberger, “Hannover v znamenju novih tehnologij,” Softw. power, No. 96, pp. 24-25, 2001.

Iztok Kramberger, “Sony kot mobilni sopotnik,” Softw. power, No. 96, pp. 74-75, 2001.

Iztok Kramberger, “Izbrati pravega,” Softw. power, No. 97, pp. 12-13, 2001.

Iztok Kramberger, “Noro hitro in izjemno drago - GeForce3,” Softw. power, No. 97, pp. 20, 2001.


Iztok Kramberger, “Hercules 3D Prophet II MX 400,” Softw. power, No. 97, pp. 21, 2001.

Iztok Kramberger, “Digitalno okno v svet,” Softw. power, No. 101, pp. 12-19, 2001.

Iztok Kramberger, “Navigacija iz hlačnega žepa: programska oprema,” Softw. power, No. 101, pp. 30-32, 2001.

Gorazd Kandus, “Modulation and coding,” Wireless flexible personalised communications COST 259, pp. 51-62.

Roman Novak, Jože Rugelj, Gorazd Kandus, “Steiner tree based distributed multicast routing in networks,” Steiner trees in industries (Combinatorial optimization), Dordrecht, Boston, London: Kluwer Academic Publishers, Vol. 11, pp. 327-351.

Y. Fun Hu, ur., et al. (25 authors), Service efficient network interconnection via satellite: EU Cost action 253. New York, USA: John Wiley 2001.

Mitja Solar, Meritve v elektroniki: učbenik. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Rudolf Babič, Tomaž Dogša, Franc Jurkovič, Mitja Solar, Gerhard Angleitner, Iztok Kramberger, Davorin Osebik, Matej Šalamon, Mitja Solar (ed.), Krožni praktikum: smer elektronika: visokošolski strokovni program, 2. letnik (3. in 4. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Rudolf Babič, Tomaž Dogša, Mitja Solar, Iztok Kramberger, Davorin Osebik, Matej Šalamon, Mitja Solar (ed.), Krožni praktikum: smer elektronika: visokošolski strokovni program, 3. letnik (5. in 6. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Anton Hamler, Bogomir Horvat, Tatjana Kapus, Ivan Zagradišnik, Marko Jesenik, Bojan Štumberger, Janez Stergar, Bojan Slemnik, Iztok Kramberger, Mitja Solar (ed.), Krožni praktikum: smer elektronika: univerzitetni program, 2. letnik (3. in 4. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Karel Jezernik, Zdravko Kačič, Rudolf Babič, Tomaž Dogša, Mitja Solar, Suzana Uran, Bojan Jarc, Matej Rojc, Matej Šalamon, Dejan Jovanovič, Mitja Solar (ed.), Krožni praktikum: smer elektronika: univerzitetni program, 3. letnik (5. in 6. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Janez Trontelj, Zmago Brezočnik, Miro Milanovič, Rudolf Babič, Anton Pleteršek, Mitja Solar, Alenka Hren, Franc Mihalič, Filip Samo Balan, Bojan Jarc, Mitja Solar (ed.), Krožni praktikum:


smer elektronika: univerzitetni program, 4. in 5. letnik (7.,8. in 9. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Uroš Drčić, Mihael Mohorčič, Gorazd Kandus, “Dinamično dodeljevanje kanalov v mobilnih komunikacijskih sistemih,” Raziskovalno delo podiplomskih študentov v Sloveniji - novo tisočletje, Naravoslovje in tehnika, Ljubljana, Slovenia, pp. 237-248.

Uroš Drčić, Gorazd Kandus, Mihael Mohorčič, Tomaž Javornik, “Interplatform link requirements in the network of high altitude platforms,” 19e Conférence et Exposition Internationales sur les Systemes de Communications par Satellites, Toulouse, France, Apr. 2001, Vol. 3/3, pp. 1-9.

Mihael Mohorčič, Gorazd Kandus, “Link-cost function analysis for adaptive routing in packet-oriented ISL networks,” 19e Conférence et Exposition Internationales sur les Systemes de Communications par Satellites, Toulouse, France, Apr. 2001, Vol. 2/3, pp. 1-9.

Damjan Vlaj, Zdravko Kačič, Bogomir Horvat, “The use of noisy frame elimination and frequency spectrum magnitude reduction in noise robust speech recognition,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 2, pp. 1127-1130.

Bojan Kotnik, Zdravko Kačič, Bogomir Horvat, “A computational efficient real time noise robust speech recognition based on improved spectral substraction method,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 2, pp. 1123-1126.

Bojan Kotnik, Zdravko Kačič, Bogomir Horvat, “A multiconditional robust front-end feature extraction with a noise reduction procedure based on improved spectral substraction algorithm,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 1, pp. 197-200.

Andrej Žgank, Bojan Imperl, Finn Tore Johansen, Zdravko Kačič, Bogomir Horvat, “Crosslingual speech recognition with multilingual acoustic models based on agglomerative and tree-based triphone clustering,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 4, pp. 2725-2728.

Andrej Žgank, Bojan Imperl, Finn Tore Johansen, Zdravko Kačič, Bogomir Horvat, “Crosslingual adaptation of multilingual triphone acoustic models,” Multilingual speech and language processing, Aalborg, Denmark, Sept. 2001, 6 pp.


Tomaž Javornik, Gorazd Kandus, “Multi-amplitude MSK signal performance in non-linear channel,” The IEEE 8th Symposium on Communications and Vehicular Technology in the Benelux Proceedings SCVT 2001, Delft, The Netherlands, Oct. 2001, pp. 102-107.

Tomaž Javornik, Gorazd Kandus, Alister Burr, “The performance of N-GMSK signals in non-linear channels,” The fourth Interntional Symposium on Wireless Personal Multimedia Communications WPMC '01, Aalborg, Denmark, Sept. 2001, pp. 391-394.

Denis Trček, Gorazd Kandus, “Building semantic business models for E-business oriented enterprises,” The fourth International Conference on Electronic Commerce Research ICECR-4, Dallas, USA, Nov. 2001, Vol. 1, pp. 224-229.

Mirjam Sepesy Maučec, Zdravko Kačič, Bogomir Horvat, “A framework for language model adaptation for highly-inflected Slovenian language,” Adaptation methods for speech recognition, Sophia-Antipolis, France, Aug. 2001, pp. 211-214.

Gorazd Kandus, Mihael Mohorčič, “High altitude platforms for communication, localisation and surveillance applications,” International Conference on Software, Telecommunications and Computer Networks SoftCOM 2001, Split-Dubrovnik, Croatia, Ancona-Bari, Italy, Oct. 2001, Vol. 1, pp. 31-39.

Marjeta Frey Pučko, Roman Novak, Gorazd Kandus, “SEPAM - CMM implementation for developing telecommunications systems,” A Net Odyssey, 27th EUROMICRO Conference, Warsaw, Poland, Sept. 2001, pp. 272-278.

Andrej Žgank, Zdravko Kačič, Bogomir Horvat, “Large vocabulary continuous speech recognizer for slovenian language,” 4th international conference Text, speech and dialogue TSD 2001, Železná Ruda, Czech Republic, Sept. 2001, pp. 242-248.

Bojan Kotnik, Tomaž Rotovnik, Zdravko Kačič, Bogomir Horvat, Boštjan Horvat, Iztok Kramberger, “The design of mobile multimodal communication device - personal navigator,” Technical Program, Bratislava, Slovakia, Vol. 2, pp. 337-340.

Andrej Kruščič, Rado Slatinek, Tatjana Kapus, “A DVD presentation for the support of teaching telecommunications protocols,” Technical Program, Bratislava, Slovakia, Vol. 2, pp. 270-273.

Janez Stergar, Bogomir Horvat, “Distance learning approach in multimedia tutoring,” Technical Program, Bratislava, Slovakia, Vol. 2, pp. 259-262.

Andrej Kruščič, Rado Slatinek, Tatjana Kapus, Bogomir Horvat, “A multimedia presentation for the support of teaching telecommunications protocols,” 3rd International symposium on Video


processing and multimedia communications VIPromCom 2001, Zadar, Croatia, June 2001, pp. 161-164.

Janez Stergar, Bogomir Horvat, “Adapting a multimedia tutorial for distance learning,” 3rd International symposium on Video processing and multimedia communications VIPromCom 2001, Zadar, Croatia, June 2001, pp. 165-168.

Roman Trobec, Roman Novak, Igor Ozimek, Gorazd Kandus, “Compressed image transmission on fix-rate digital channels,” 3rd International symposium on Video processing and multimedia communications VIPromCom 2001, Zadar, Croatia, June 2001, pp. 203-207.

Janez Stergar, Bogomir Horvat, “Using scription language in multimedia authoring tool,” 24th international convention MIPRO 2001, Opatija, Croatia, May 2001, pp. 39-42.

Igor Nastoski, Bogomir Horvat, Rado Slatinek, “Multimedijska predstavitev klica PSTN v vmesniku ATM s storitvami LES,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 393-396.

Aleš Švigelj, Mihael Mohorčič, Gorazd Kandus, Janez Bešter, “Analiza adaptivnega usmerjanja v omrežju medsatelitskih povezav,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 179-182.

Uroš Drčić, Mihael Mohorčič, Gorazd Kandus, “Povezave med stratosferskimi ploščadmi v omrežju HeliNet,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 175-178.

Bogomir Horvat, “A multilingual society,” The second symposium Extra skills for young engineers ESYE 2001, Maribor, Slovenia, Oct. 2001, pp. 7-10.

Janez Stergar, Vladimir Hozjan, “Steps towards preparation of text corpora for data driven symbolic prosody,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 79-84.

Andrej Žgank, “The development of UMB Broadcast News 1996 transcription system,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 133-138.

Bogomir Horvat, “Transforming the University,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 25-37.

Gorazd Kandus, “Primerjava nacionalnih načrtov oštevilčenja v članicah EU in predstavitev nujnih sprememb načrta oštevilčenja v Republiki Sloveniji,” 1. mednarodni simpozij o pravnih


vidikih informacijske družbe na temo Izvajanje nove pravne ureditve na področju telekomunikacij, Portorož, Slovenia, Nov. 2001, 4 pp.


Prof. Dr. Bogomir Horvat: 7th International Science Workshop Advances in speech technology, Faculty of Electrical Engineering and Computer Science, University of Maribor, Slovenia, July 5–6, 2001.


Prof. Dr. Bogomir Horvat, Damjan Vlaj:

Visit to Corporate Research Laboratories of SIEMENS, Munich, Germany, Jan. 12, 2001.

Andrej Žgank: Board meeting of the COST 278 project, Eurecom, Sophia-Antipolis, France, Oct. 1–2, 2001.

Janez Strgar, MSc, Damjan Vlaj:

Visit to Corporate Research Laboratories of SIEMENS, Munich, Germany, Dec. 3–7, 2001.

Andrej Žgank: Visit to Corporate Research Laboratories of SIEMENS, Munich, Germany, Dec. 10–14, 2001.

GUESTS AND VISITORS

Udo Hain (Corporate Research Laboratories of SIEMENS, Munich, Germany):

Bilateral scientific co-operation, May 14–18, 2001.

Dr. Harald Höge, Cristian Geissler, Erdem Caglayan, Bernt Andrassy, Josef Bauer, Udo Hain (Corporate Research Laboratories of SIEMENS, Munich, Germany):

Bilateral scientific co-operation, July 4–6, 2001.



Prof. Dr. Bogomir Horvat and Digital and Information Systems Laboratory, Award for Achievements in Cooperation in International Research Projects, Faculty of Electrical Engineering and Computer Science, Maribor, Slovenia, Nov. 2001.

Electronic Systems Laboratory EL – 15

ELECTRONIC SYSTEMS LABORATORY

Head:

Asst. Prof. Dr. Rudolf Babič

Phone: +386 2 220 72 30


RESEARCH PROJECTS


Applied projects

Digital Filters Realization with Field Programmable Gate Arrays

Leader: Asst. Prof. Dr. Rudolf Babič Participants: Bojan Jarc, MSc; Davorin Osebik MSc, Asst. Prof. Dr. Mitja Solar;

Matej Šalamon, MSc; Anton Vesenjak

Financed by: personal research funds Duration: two years

The main aim of this permanent project is the realization of higher-order, nonrecursive digital filters with field-programmable gate arrays, FPGA circuits. We have found that distributed arithmetic is well suited for this research. The scope of our research is the investigation of distributed arithmetic structures with ROM-accumulator architecture and distributed arithmetic structures with online calculation of partial sums of coefficients.

They have ROM capabilities as low as possible and also offer the realization of higher-order, nonrecursive digital filters with high-speed of operation. Using XILINX 4000 FPGA circuits for realization of digital filter, a sampling frequency of 400 kHz was obtained

We are searching for an appropriate design for structures that would allow implementation of online calculation of partial sums of coefficients with programmable gate arrays working at highest possible speeds.

Simultaneously with the development of FIR digital filter structures we’re working on the implementation of adaptive algorithms using FPGA circuits. Due to limited ability for execution of arithmetic operations with FPGA circuits, we have developed structures allowing implementation of required numerical calculations with FPGAs. We would like to emphasize

EL – 16 Electronic Systems Laboratory

the implementation of a sequence of 16 multipliers linked to a group of 16 sequential adders.

We have used the above described structures to design an adaptive filter with online calculation of the partial sums of coefficients together with an LMS algorithm, which is simple enough for realization in FPGA distributed arithmetic. This filter is used for extraction of signal from background noise. We have achieved 100 kHz input sampling frequency with this adaptive FIR filter featuring 16 coefficients, 16 bit input-output word and 16 bit internal arithmetic, implemented with XILINX series 4000 FPGA. This filter improved signal to noise ratio for 15 dB.

We are also working on FPGA prototype circuits design for student laboratory practice. Our goal is to attract more students to research work in the field of digital filters.

Problem tracking system

Leader: Asst. Prof. Dr. Tomaž Dogša Participants: Branko Drevenšek; Matej Šalamon, MSc

Financed by: personal research funds Duration: two years

The purpose of this project was to develop software testing tools that would be suitable for verification of electronic circuit simulators. During this year we focused mainly on DC operating points. Our testing tool generates many electrical circuits with random topology and elements and automates test execution and failure detection. We tested different versions of SPICE simulators. With these tools it is possible to compare more objectively the quality of simulators.

PUBLICATIONS

Rudolf Babič, “Dinamika izhodnega signala pri kaskadni obliki izvedbe nerekurzivnih digitalnih sit,” Inf. MIDEM, Vol. 31, No. 3, pp. 153-159, 2001.

Tomaž Dogša, “Dodatni primerjalni testi za simulatorje SPICE,” Inf. MIDEM, Vol. 31, No. 2, pp. 88-93, 2001.

Davorin Osebik, Rudolf Babič, Bogomir Horvat, “Adaptivna digitalna sita v strukturi porazdeljene aritmetike,” Inf. MIDEM, Vol. 31, No. 3, pp. 160-168, 2001.

Albin Pevec, Janez Trontelj, “Reverse voltage and overvoltage protection for a 5V CMOS technology,” Inf. MIDEM, Vol. 31, No. 4, pp. 283-286, 2001.

Electronic Systems Laboratory EL – 17

Anton Pleteršek, “Integrated optical position microsystem with programmable resolution,” Inf. MIDEM, Vol. 31, No. 4, pp. 271-277, 2001.

Janez Trontelj, “Intelligent system for decoupling multiple RFID tags,” Inf. MIDEM, Vol. 31, No. 4, pp. 261-264, 2001.

Rudolf Babič, Davorin Osebik, “Uporaba strukture porazdeljene aritmetike pri izvedbi sistemov za obdelavo signalov,” Svet elektron., Vol. 8, No. 77, pp. 20-24, 2001.

Marjan Bezjak, Miro Milanovič, Rudolf Babič, “Stikalni močnostni tonski ojačevalnik,” Svet elektron., Vol. 8, No. 72, pp. 50-55, 2001.

Tomaž Dogša, “Simulatorji v elektroniki,” Svet elektron., Vol. 8, No. 73, pp. 23-27, 2001.

Tomaž Dogša, “Splošen koncept načrtovanja testnih primerov,” Uporab. inform., Vol. 9, No. 2, pp. 75-79, 2001.

Matej Šalamon, Tomaž Dogša, “Napadi na kriptografske sisteme,” Uporab. inform., Vol. 9, No. 3, pp. 122-129, 2001.

Marjan Bezjak, Miro Milanović, Rudolf Babič, “Stikalni močnostni tonski ojačevalniki,” Akustika: konstrukcije in samogradnje akustičnih naprav, Ljubljana, Slovenia, pp. 78-86.

Rudolf Babič, Operacijski ojačevalniki: vrste, lastnosti in osnovna vezja. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Rudolf Babič, Tomaž Dogša, Franc Jurkovič, Mitja Solar, Gerhard Angleitner, Iztok Kramberger, Davorin Osebik, Matej Šalamon, Mitja Solar (ed.), Krožni praktikum: smer elektronika: visokošolski strokovni program, 2. letnik (3. in 4. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Rudolf Babič, Tomaž Dogša, Mitja Solar, Iztok Kramberger, Davorin Osebik, Matej Šalamon, Mitja Solar (ed.), Krožni praktikum: smer elektronika: visokošolski strokovni program, 3. letnik (5. in 6. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.


EL – 18 Electronic Systems Laboratory

Janez Trontelj, Zmago Brezočnik, Miro Milanovič, Rudolf Babič, Anton Pleteršek, Mitja Solar, Alenka Hren, Franc Mihalič, Filip Samo Balan, Bojan Jarc, Mitja Solar (ed.), Krožni praktikum: smer elektronika: univerzitetni program, 4. in 5. letnik (7.,8. in 9. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Anton Pleteršek, “Vir nastavljive referenčne napetosti,” Patent Request No. P-200100146, Ljubljana, Urad Republike Slovenije za intelektualno lastnino, May 29, 2001.

Bojan Jarc, Rudolf Babič, “Second order statistics spectrum estimation method for robust speech recognition,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 1, pp. 229-232.

Robert Veronik, Zdravko Kačič, Nada Hernja, Milan Brumec, “Multimedijski večjezični sistem za učenje in vadbo izgovorjave slušno in govorno motenih otrok,” 2nd congress of Croatian speech and language pathologists, Mošćenička Draga, Croatia, Sept. 2001, pp. 64-65.

Anton Pleteršek, “Integrated reference circuits - design and properties,” 37th International Conference on Microelectronics, Devices and Materials and the Workshop on Optoelectronic Devices and Applications, Bohinj, Slovenia, Oct. 2001, pp. 117-122.

Bojan Jarc, Rudolf Babič, “Dušenje šuma v govornem signalu s pomočjo statistične ocene,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 167-170.

Davorin Osebik, Rudolf Babič, “Produkt dveh vektorjev s FPGA vezji in njegova uporaba pri izvedbi adaptivnih sit,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 57-60.

Matej Šalamon, Tomaž Dogša, “Odpornost kaotičnih šifrirnih sistemov na statični napad,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 73-76.

Microcomputer Systems Laboratory EL – 19

MICROCOMPUTER SYSTEMS LABORATORY

Head:


Phone: +386 2 220 72 10


RESEARCH PROJECTS



2001-MGCP-FERI Razpoznavalnik in konstruktor protokola MGCP (Decoder and Encoder of MGCP)

Leader: Boštjan Vlaovič Participants: Aleksander Vreže, Peter Vicman, Simon Nedok, Assoc. Prof. Dr.

Zmago Brezočnik Partner: Iskratel Ltd.

Financed by: Iskratel Ltd.

The development of Decoder and Encoder of Media Gateway Control Protocol (MGCP) includes an analysis of the protocol, functional and design specification of the software, and its realisation using special programming tools, which produce the C code. The decoder and encoder are parts of the MGCP protocol stack developed jointly with Iskratel Ltd. The aim of the project is to enable Iskratel's switch node SI2000 V5 to actively participate in the development of the Next Generation Telecommunication Networks.

2001-SIPTEL-FERI Razpoznavalnik, konstruktor in krmilni protokol protokolov SIP in SDP za IP telefon (Decoder, Encoder, and Protocol Control for SIP and SDP protocols for IP telephone)

Leader: Boštjan Vlaovič Participants: Peter Vicman, Simon Nedok, Aleksander Vreže, Assoc. Prof. Dr.


EL – 20 Microcomputer Systems Laboratory

Financed by: Iskratel Ltd.

Decoder, Encoder, and Protocol Control of SIP and SDP protocols for the IP telephone is part of a joint project with the company Iskratel Ltd. The main objective is to develop a modern IP telephone with the use of SIP (Session Initiation Protocol) signalling. Parts of the program code from project 2000-JG-BV-FERI will be adapted to new requirements and ported to Real Time Operating System VxWorks.


VISIOCOM Video-supported online communities

Co-ordinator: Asst. Prof. Dr. Matjaž Debevc Participant: Bogdan Dugonik, MSc Project partners: Center for Distance Education Development, University of Maribor;

Society for Project and Research Work on Internet MIRK; Rehabilitation Technology Centre of Tallinn Technical University (RTC TTU), Estonia; Hapinet Distance Learning Center, Hungary

Financed by: European Union (programme Phare-ACCESS)

The basic aim of this project is to enhance the applicability of and access to video-supported technologies for people with special needs as well as in the environments in which the use of the technologies is still rare. As part of the project, new technological solutions, such as web-supported video lecturing, streaming video on demand, innovative videoconferencing solutions, and video-supported collaboration solutions will be presented, which allow the people with special needs an easier access to learning materials.

BITEMA Bilingual Teaching Material for the Deaf by Means of ICT

Co-ordinator: Niels Nielsen, Denmark Participant: Bogdan Dugonik, MSc Project partners: institutions from Denmark, France and Slovenia

Financed by: European Union (programme Socrates-GRUNDTVIG)

In the framework of this project, educational methods for deaf adults who cannot apply for a better job because of a lower level of knowledge or bad qualifications will be enhanced. Appropriate technical, software and didactical tools will be proposed and developed to help improve the knowledge level of the adults. Special software will be developed, which will enable tutors to prepare learning material on the web by themselves. The tool will allow them to prepare the material containing multimedia elements, such as video, 3D-animation, videochat, web-chat, and others.




2000-JG-BV-FERI Specifikacija in realizacija prehoda SIP-V5.2 (Specification and realisation of SIP-V5.2 Gateway)

Leader: Boštjan Vlaovič Participants: Peter Vicman, Simon Nedok, Aleksander Vreže, Assoc. Prof. Dr.


Financed by: Iskratel Ltd. Duration: January to October 2001

Specification and realisation of SIP-V5.2 Gateway included a study of Session Initiation Protocol (SIP) and Session Description Protocol (SDP). The objective was to develop SIP-V5.2 interface for the Iskratel's Switch Node SI2000 V5 which would enable SIP telephones to connect to the switch and to use available services. The project was realised with the use of programming language C and SDL (Specification and Description Language).


DETECH Development of the Department for Technology Supported Distance Education

Co-ordinator: Asst. Prof. Dr. Matjaž Debevc Participant: Bogdan Dugonik, MSc Project partners: University of Maribor, Slovenia; Technical University of Vienna,

Austria; University of Oulu, Finland; Gjovik College – Higher Education Institution, Norway; Fernuniversität Hagen, Germany; Open University, England

Financed by: European Union Duration: November 1999 to November 2001

The main goal of the project was to establish a department for technology-supported distance education as a part of the Center for Distance Education Development at the University of Maribor. An organisational, didactical, technological, administrational and financial model of the distance education had to be prepared. On the local level, the establishment of the department, i.e. the implementation of the five models, should make it possible to introduce distance learning as an additional form of education at the faculties of the University of Maribor. On the global level, it should have helped the university to participate in the


programme SOCRATES – Open and Distance Learning Action (ODL).

PUBLICATIONS

Filip Samo Balan, Zmago Brezočnik, “Multi-channel receiver for CDMA using a digital signal processor and FPGA circuit,” Inf. MIDEM, Vol. 31, No. 3, pp. 191-196, 2001.

Bogdan Dugonik, “Digitalne video kamere,” Monitor, Vol. 11, No. 9, pp. 82-88, Sept. 2001.

Bogdan Dugonik, “Videoobdelava s Pinnaclom in Fastom,” Monitor, Vol. 11, No. 9, pp. 100-103, Sept. 2001.

Filip Samo Balan, Darko Koritnik, Andrej Korošec, Andrej Orgulan, Jože Voršič, “Hitra kalibracija flikmetra za pravilno oceno kakovosti napetosti po EN 50160,” ER, Vol. 2, No. 3, pp. 48-50, 2001.

Bogdan Dugonik, “Digitalna fotoaparata,” Win.ini, Vol. 10, No. 2, pp. 25-27, 2001.

Bogdan Dugonik, “CAMEDIA E-10,” Win.ini, Vol. 10, No. 3, pp. 28-29, 2001.

Bogdan Dugonik, “Hewlett-Packard Photo Solution,” Win.ini, Vol. 10, No. 4, pp. 38-39, 2001.

Bogdan Dugonik, “Preprosta računalniška orodja za montažo videa,” Win.ini, Vol. 10, No. 4, pp. 35-37, 2001.

Bogdan Dugonik, “Canon EOS D3O Digital SLR,” Win.ini, Vol. 10, No. 5, pp. 34-35, 2001.

Boštjan Vlaovič, Robert Meolic, “Radioamatersko računalniško omrežje,” Softw. power, No. 93, pp. 10, 2001.

Matjaž Debevc, Boštjan Vlaovič, Oblikovanje dokumentov za svetovni splet. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.


Janez Trontelj, Zmago Brezočnik, Miro Milanovič, Rudolf Babič, Anton Pleteršek, Mitja Solar, Alenka Hren, Franc Mihalič, Filip Samo Balan, Bojan Jarc, Mitja Solar (ed.), Krožni praktikum:


smer elektronika: univerzitetni program, 4. in 5. letnik (7.,8. in 9. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Bogdan Dugonik, “Computer based video production,” World Conference on Educational Multimedia, Hypermedia and Telecommunications ED-MEDIA 2001, Tampere, Finland, June 2001, pp. 456-457.

Bogdan Dugonik, Aleksandra Dugonik, Zmago Brezočnik, “Advanced computer applications in tele dermatology,” 5th WSES International Conference on Circuits, Systems, Communications and Computers (CSCC 2001), 3rd WSES International Conference on Mathematics and Computers in Physics (MCP 2001), 3rd WSES International Conference on Mathematics and Computers in Mechanical Engineering (MCME 2001), Rethymno, Greece, July 2001, pp. 27-31.

Simon Nedok, Boštjan Vlaovič, Tatjana Kapus, Zmago Brezočnik, “FSK message indication service for analog telephone,” 5th WSES International Conference on Circuits, Systems, Communications and Computers (CSCC 2001), 3rd WSES International Conference on Mathematics and Computers in Physics (MCP 2001), 3rd WSES International Conference on Mathematics and Computers in Mechanical Engineering (MCME 2001), Rethymno, Greece, July 2001, pp. 115-118.

Tatjana Kapus, “Reasoning about mobile processes in an ambient using the temporal logic of actions,” 5th WSES International Conference on Circuits, Systems, Communications and Computers (CSCC 2001), 3rd WSES International Conference on Mathematics and Computers in Physics (MCP 2001), 3rd WSES International Conference on Mathematics and Computers in Mechanical Engineering (MCME 2001), Rethymno, Greece, July 2001, pp. 132-137.

Peter Vicman, Filip S. Balan, Zmago Brezočnik, “Correlation coprocessor for multichannel CDMA receiver,” 5th WSES International Conference on Circuits, Systems, Communications and Computers (CSCC 2001), 3rd WSES International Conference on Mathematics and Computers in Physics (MCP 2001), 3rd WSES International Conference on Mathematics and Computers in Mechanical Engineering (MCME 2001), Rethymno, Greece, July 2001, pp. 261-264.

Andrej Kruščič, Rado Slatinek, Tatjana Kapus, Bogomir Horvat, “A multimedia presentation for the support of teaching telecommunications protocols,” 3rd International symposium on Video processing and multimedia communications VIPromCom 2001, Zadar, Croatia, June 2001, pp. 161-164.


Bogdan Dugonik, Matjaž Debevc, “Contemporarily video production for distance education system,” 3rd International symposium on Video processing and multimedia communications VIPromCom 2001, Zadar, Croatia, June 2001, pp. 221-224.

Bogdan Dugonik, Aleksandra Dugonik, Zmago Brezočnik, “Applied advanced computer technologies in dermatology,” IX Mediterranean Conference on Medical and Biological Engineering and Computing MEDICON 2001, Pula, Croatia, June 2001, Vol. 1, pp. 123-126.

Andrej Kruščič, Rado Slatinek, Tatjana Kapus, “A DVD presentation for the support of teaching telecommunications protocols,” Technical Program, Bratislava, Slovakia, Vol. 2, pp. 270-273.

Robert Meolic, Tatjana Kapus, Zmago Brezočnik, “CTL and ACTL patterns,” Technical Program, Bratislava, Slovakia, Vol. 2, pp. 540-543.

Boštjan Vlaovič, Zmago Brezočnik, “Packet based telephony,” Technical Program, Bratislava, Slovakia, Vol. 1, pp. 210-213.

Robert Meolic, Tatjana Kapus, Ernest Gungl, Zmago Brezočnik, “Verification of mutual exclusion algorithms with EST,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 15-18.

Dragoslav Petrovič, Boštjan Vlaovič, “MBone: ogrodno omrežje za oddajo več uporabnikom hkrati,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 71-74.

Dragoslav Petrovič, Boštjan Vlaovič, “Orodja za uporabo omrežja MBone,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 67-70.

Boštjan Vlaovič, Zmago Brezočnik, “VoIP - protokola SIP in SDP,” TELEINFOS, Ljubljana, Slovenia, May 2001, 32 pp.

Zmago Brezočnik, “Interdisciplinarni in kreditni študij,” GetWork: zgrabi priložnost, Ljubljana, Slovenia, pp. 20-21.


Boštjan Vlaovič, “IEEE engineer in the new millennium,” invited lecture at the 4th Congress of Electrotechnical and Computer Science Students Job fair 2001, Zagreb, Croatia, March 26–30, 2001.


Damjan Zazula, Aleksander Vreže, Božidar Potočnik, Aleš Holobar, Joseph DiCarlo, Zoltan Sep, Dean Korošec, Matjaž Divjak, Boris Cigale, Danilo Korže, “Teachware and VIDERO Improvements,” a talk at the CoLoS Meeting 2001, Murcia, Spain, Sept. 13–15, 2001.

Bogdan Dugonik, A demonstration of recent technology, production and video transfer options using the Internet, at the co-ordination meeting of the BITEMA project partners, Centre for Deaf People, Castberggaard, Danmark, Oct. 26–28, 2001.


Boštjan Vlaovič: Organisation of the Creative Workshop for Students “How to Make Convergence a Business?”, TeleINFOS 2001, Ljubljana, Slovenia, May 17, 2001.

Bogdan Dugonik, MSc: Organisation and implementation of the workshop “Videoproduction for distance education” during the international conference DETECH 2001, Maribor, Slovenia, Sept. 13–14, 2001.

Assoc. Prof. Dr. Zmago Brezočnik, Assoc. Prof. Dr. Tatjana Kapus:

Co-ordinated organisation of the IEEE Slovenia Section Paper Contest during the ERK 2001 conference, Portorož, Slovenia, Sept. 25, 2001.

Assoc. Prof. Dr. Zmago Brezočnik, Filip Samo Balan, MSc, Aleš Časar, MSc, Robert Meolic, MSc, Simon Nedok, Boštjan Vlaovič, Aleksander Vreže:

Organisation of the symposium “Extra skills for young engineers”, Maribor, Slovenia, Oct. 17–19, 2001.

Boštjan Vlaovič, Aleš Časar, MSc, Robert Meolic, MSc, Filip Samo Balan, MSc:

Editors of the Proceedings of the symposium “Extra Skills for Young Engineers”, Maribor, Slovenia, 2001.

Assoc. Prof. Dr. Zmago Brezočnik: Program committee member, 11. delavnica o telekomunikacijah: Dostop do telekomunikacijskih storitev (11th Workshop on Telecommunications: Access to Telecommunications Services), Brdo pri Kranju, Slovenia, May 14–15, 2001.


Assoc. Prof. Dr. Zmago Brezočnik: Program committee member, 6th International Conference on Telecommunications ConTEL 2001, Zagreb, Croatia, June 13–15, 2001.

Assoc. Prof. Dr. Zmago Brezočnik: IEEE Slovenia Section Vice-Chairman and University of Maribor IEEE Student Branch Counsellor.


Boštjan Vlaovič: Participation in the intensive seminar Radiokomunikacije 2001 (Radiocommunications 2001), Ljubljana, Slovenia, April 18–20, 2001.

Assoc. Prof. Dr. Zmago Brezočnik: Member of the commission for the PhD defence of Gordan Ježić, MSc, Department of Telecommunications, Faculty of Electrical Engineering and Computing, University of Zagreb, April 26, 2001.

Bogdan Dugonik, MSc: Participation in the meeting of the project VISIOCOM partner institution representatives, Hapinet Distance Learning Center, Budapest, Hungary, Nov. 22–24, 2001.

GUESTS AND VISITORS

Miran Bratkovič, Franc Gašperič (Iskratel Kranj, Slovenia):

Signing of a development project contract, Jan. 23, 2001.

Kimmo Salmenjoki (University of Vaasa, Vaasa, Finland):

Discussion about study programmes at the Faculty of Electrical Engineering and Computer Science, University of Maribor, Slovenia, May 31, 2001.

Foreign guests of the European House during the Energy and Environment Meeting:

Visit of some laboratories at the Faculty of Electrical Engineering and Computer Science, University of Maribor, Slovenia, Oct. 6, 2001.



Assoc. Prof. Dr. Zmago Brezočnik and Microcomputer Systems Laboratory, an honour for successful and innovative collaboration with the Iskratel Ltd. company, Kranj, Slovenia, received from the Faculty of Electrical Engineering and Computer Science, University of Maribor, on the Faculty Day, Nov. 27, 2001.

EL – 28 Digital Signal Processing Laboratory

DIGITAL SIGNAL PROCESSING LABORATORY

Head:

Assoc. Prof. Dr. Zdravko Kačič

Phone: +386 2 220 72 20


RESEARCH PROJECTS


Applied project

Software for automatic speech recognition

Leader: Prof. Dr. Bogomir Horvat Participants: Assoc. Prof. Dr. Zdravko Kačič; Matej Rojc, MSc; Damjan Vlaj;

Bojan Kotnik; Janez Stergar, MSc

Financed by: Corporate Research Laboratories of SIEMENS A.G.

The goal of this project is the development of software for automatic speech recognition and speech synthesis. The tasks encompass speech pre-processing, feature extraction and acoustic modelling for automatic speech recognition and development of a multilingual text-to-speech synthesis system. Application domains: telecommunication systems, office automation.


INTERFACE - Project IST – 1999 – 10036 (fifth framework)

Multimodal Analysis/Synthesis System for Human Interaction to Virtual and Augmented Environments

Leader: Assoc. Prof. Dr. Zdravko Kačič Participants: 14 partners from 8 European countries and Australia

Digital Signal Processing Laboratory EL – 29

Financed by: EU

This project will define new models and will implement advanced tools for audio-video analysis, synthesis and representation in order to provide essential technologies for the implementation of large-scale virtual and augmented environments. The metaphor, which will inspire the project approach, is oriented to make person-machine interaction as natural as possible, based on everyday human communication means like speech, facial expressions and body gestures from both sides. A case study application on Internet will be developed and demonstrated.

The figure presents JAVA applet, which is a part of network version of common software platform (N-

CSP). N-CSP is product of the Interface project. Applet analyses speech signal and recognise emotion and gender of speaker.

Evaluation of multilingual speech resources and tools

Leader: Prof. Dr. Bogomir Horvat Participants: Assoc. Prof. Dr. Zdravko Kačič; Matej Rojc, MSc; Janez Stergar,

MSc; Vladimir Hozjan; Andrej Žgank; Dr. Mirjam Sepesy Maučec

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, Ministry of External Affairs of Spain


Goal of this project is to gain new knowledge and experiences in the field of multilingually spoken language resources and automatic speech recognition. The focus of the proposed cooperation is the analysis and evaluation of language resources and methods of language modelling based on language independent approach - statistical language modelling. The experimental work is based on the use of SpeechDat databases for Spanish and Slovenian language.

COST Action 278 Spoken Language Interaction in Telecommunication

Leader: Assoc. Prof. Dr. Zdravko Kačič Participants: 19 countries of the West, East, and Central Europe

Financed by: EU, co-financed by the Ministry of Education, Science and Sport of the Republic of Slovenia

The main objective of this project is to create knowledge in several problem areas of spoken language interaction in telecommunications in order to achieve communicative interfaces that provide a natural human-computer interaction through more cognitive, intuitive and robust interfaces, whether monolingual, multilingual or multimodal. The work encompasses research on speech and dialogue processing in multimodal communication interfaces, issues related to robustness and multilinguality, human-computer dialogue theories, and models and systems as well as associated tools for the establishment of interactive systems. It also involves the evaluation of telecommunication applications in which spoken language is the only or one of many types of input or output modalities.



INCO COPERNICUS – Project 977126

A Multimedia Multilingual Teaching and Training System for Speech Handicapped Children

Leader: Assoc. Prof. Dr. Zdravko Kačič Participants: Technical University of Budapest (Hungary), Robot Control Software

ltd. (Hungary), University of Reading (Great Britain), University of Maribor (Slovenia)

Financed by: EU Duration: 1998 – 2001

The aim of this project was to develop a new audio-visual pronunciation teaching and training method and a software system for hearing and speech-handicapped persons to help them


control speech production. A teaching method has been drawn up for progression from individual sound preparation to the practice of sounds in sentences. The software system is planned to be built in different modules. The basis is a general language-independent measuring system and a database editor. The database editor makes it possible to construct modules for all participant languages and for different speech disabilities. Two modules are planned for construction in all languages: one is for teaching and training vowels to hearing-impaired children and the other is for correcting misarticulated fricative sounds. These are the most common forms of articulation disorders. The system helps patients to discover how to control their speech organs by simultaneously comparing the visual patterns (speech pictures) of a normal acoustic speech signal with a defective one. While watching and viewing the system, the patient can simultaneously see and hear a speech pattern.

Exercise of uttered letter “z”.

PUBLICATIONS

Daniel Čeh-Ambruš, Iztok Kramberger, Zdravko Kačič, “Razvoj razširitvene kartice s signalnim procesorjem za PCI vodilo,” Inf. MIDEM, Vol. 31, No. 1, pp. 48-52, 2001.


Bojan Kotnik, Tomaž Rotovnik, Zdravko Kačič, Bogomir Horvat, Boštjan Horvat, Iztok Kramberger, “Zasnova mobilne multimodalne komunikacijske naprave - osebni navigator,” Inf. MIDEM, Vol. 31, No. 1, pp. 39-47, 2001.

Vladimir Hozjan, Zdravko Kačič, Bogomir Horvat, “Analiza prozodičnih značilk govora za modeliranje emocij,” Electrotechnical Review, Vol. 68, No. 4, pp. 213-218, 2001.

Damjan Vlaj, Zdravko Kačič, Bogomir Horvat, “Odstranjevanje šumnih značilk pri avtomatskem razpoznavanju govora,” Electrotechnical Review, Vol. 68, No. 4, pp. 220-224, 2001.

Zdravko Kačič, “Issues on development of infrastructure of modern information society,” Informatologia, Vol. 34, No. 1-2, pp. 69-72, 2001.

Bojan Kotnik, Tomaž Rotovnik, “Mobilna multimodalna komunikacijska naprava - osebni navigator,” Svet elektron., Vol. 8, No. 75, pp. 28-35, 2001.


Vladimir Hozjan, Zdravko Kačič, “Analysis of prosodic featurs and development of automatic emotion detection of emotional speech,” International conference on Augmented virtual environments and three-dimensional imaging EUROIMAGE ICAV3D 2001, Mykonos, Greece, May 2001, pp. 136-139.

Bernt Andrassy, Damjan Vlaj, Christophe Beaugeant, “Recognition performance of the siemens front-end with and without frame dropping on the aurora 2 database,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Spet. 2001, Vol. 1, pp. 193-196.

Bojan Kotnik, Zdravko Kačič, Bogomir Horvat, “A computational efficient real time noise robust speech recognition based on improved spectral substraction method,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 2, pp. 1123-1126.

Bojan Kotnik, Zdravko Kačič, Bogomir Horvat, “A multiconditional robust front-end feature extraction with a noise reduction procedure based on improved spectral substraction algorithm,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 1, pp. 197-200.


Marcel Ogner, Zdravko Kačič, “Speaker normalization based on test to reference speaker mapping,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 2, pp. 1507-1510.

Matej Rojc, Zdravko Kačič, “Representation of large lexica using finite-state transducers for the multilingual text-to-speech synthesis systems,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 3, pp. 2251-2254.

Jari Turunen, Damjan Vlaj, “A study of speech coding parameters in speech recognition,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 4, pp. 2363-2366.

Mirjam Sepešy Maučec, Zdravko Kačič, “Topic detection for language model adaptation of highly-inflected language by using a fuzzy comparison function,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 1, pp. 243-246.

K. Vicsi, P. Roach, A. Öster, Zdravko Kačič, F. Csatari, A. Sfakianaki, Robert Veronik, “A multilingual, multimodial, speech training system SPECO,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 4, pp. 2807-2810.

Damjan Vlaj, Zdravko Kačič, Bogomir Horvat, “The use of noisy frame elimination and frequency spectrum magnitude reduction in noise robust speech recognition,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 2, pp. 1127-1130.

Andrej Žgank, Bojan Imperl, Finn Tore Johansen, Zdravko Kačič, Bogomir Horvat, “Crosslingual speech recognition with multilingual acoustic models based on agglomerative and tree-based triphone clustering,” 7th European conference on Speech communication and technology Eurospeech 2001 Scandinavia, Aalborg, Denmark, Sept. 2001, Vol. 4, pp. 2725-2728.

Andrej Žgank, Bojan Imperl, Finn Tore Johansen, Zdravko Kačič, Bogomir Horvat, “Crosslingual adaptation of multilingual triphone acoustic models,” Multilingual speech and language processing, Aalborg, Denmark, Sept. 2001, 6 pp.

Mirjam Sepesy Maučec, Zdravko Kačič, “Language model adaptation for highly-inflected Slovenian language in comparison to English language,” The Corpus linguistics 2001 conference, Lancaster, Great Britain, Mar. 2001, pp. 523-530.


Mirjam Sepesy Maučec, Zdravko Kačič, Bogomir Horvat, “A framework for language model adaptation for highly-inflected Slovenian language,” Adaptation methods for speech recognition, Sophia-Antipolis, France, Aug. 2001, pp. 211-214.

Bojan Kotnik, Tomaž Rotovnik, Zdravko Kačič, Bogomir Horvat, Boštjan Horvat, Iztok Kramberger, “The design of mobile multimodal communication device - personal navigator,” Technical Program, Brartislava, Slovakia, Vol. 2, pp. 337-340.

Andrej Žgank, Zdravko Kačič, Bogomir Horvat, “Large vocabulary continuous speech recognizer for Slovenian language,” 4th international conference Text, speech and dialogue TSD 2001, Železná Ruda, Czech Republic, Sept. 2001, pp. 242-248.

Robert Veronik, Zdravko Kačič, Nada Hernja, Milan Brumec, “Multimedijski večjezični sistem za učenje in vadbo izgovorjave slušno in govorno motenih otrok,” 2nd congress of Croatian speech and language pathologists, Mošćenička Draga, Croatia, Sept. 2001, pp. 64-65.

Robert Veronik, Zdravko Kačič, Klara Vicsi, Ferenc Csatari, Peter Roach, Anne-Marie Öster, Peter Barczikay, “A new way of multimedia supported teaching and training of correct pronunciation for speech handicapped children,” 3rd International symposium on Video processing and multimedia communications VIPromCom 2001, Zadar, Croatia, June 2001, pp. 169-172.

Mirjam Sepesy Maučec, Zdravko Kačič, “Verjetnostno modeliranje slovenskega jezika,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 249-252.

Aleksandra Zögling Markuš, Zdravko Kačič, “Collection of large vocabulary speech database for Slovenian language,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 205-211.

Vladimir Hozjan, “Prosody feature analysis of emotional speech,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 199-204.

Zdravko Kačič, “Speech as a comunication modality in multimodal communication services,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 117-122.

Marcel Ogner, Zdravko Kačič, “Speaker normalization in articulation training systems using analysis by synthesis,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 213-218.


Matej Rojc, “Representation of large lexica by sequential transducers,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 123-132.

Mirjam Sepešy Maučec, “Language model adaptation by topic detection in american english Broadcast News domain,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 139-145.

Janez Stergar, Vladimir Hozjan, “Steps towards preparation of text corpora for data driven symbolic prosody,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 79-84.

Robert Veronik, Zdravko Kačič, Klara Visci, Ferenc Csatari, Peter Roach, Anne-Marie Öster, Peter Barczikay, “A multimedia multilingual teaching and training system for speech handicapped children - progress report,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 245-250.

Damjan Vlaj, “Missing feature detection in various noisy environments,” Advances in speech technology: seventh International Workshop, Maribor, Slovenia, July 2001, pp. 147-155.


Assoc. Prof. Dr. Zdravko Kačič: 7th International Science Workshop Advances in speech technology, Faculty of Electrical Engineering and Computer Science, University of Maribor, Slovenia, July 5–6, 2001.


Assoc. Prof. Dr. Zdravko Kačič, Bojan Kotnik:

Visit to Corporate Research Laboratories of SIEMENS, Munich, Germany, Jan. 12, 2001.

Assoc. Prof. Dr. Zdravko Kačič: Board meeting of the INTERFACE project, Umea, Sweden, Feb. 14–18, 2001.

Assoc. Prof. Dr. Zdravko Kačič, Robert Veronik, Marcel Ogner:

Board meeting of the Speco project, KTH, Stockholm, Sweden, May 3–7, 2001.

Assoc. Prof. Dr. Zdravko Kačič, Vladimir Hozjan:

Board meeting of the INTERFACE project, Mykonos, Greece, May 29 to June 4, 2001.


Assoc. Prof. Dr. Zdravko Kačič: “Audio Signal Processing”, Visiting professor at Umea University, Sweden, Aug. 25 to Nov. 10, 2001.

Matej Rojc, MSc: Visit to Corporate Research Laboratories of SIEMENS, Munich, Germany, Oct. 21–27, 2001.

Assoc. Prof. Dr. Zdravko Kačič: “Speech Synthesis – from monotony to emotion”, Invited lecture at Linkopingu University, Sweden, Nov. 2, 2001.

Assoc. Prof. Dr. Zdravko Kačič: Board meeting of the Speco project, Technical University of Budapest, Budapest, Hungary, Nov. 15–17, 2001.

GUESTS AND VISITORS

Udo Hain (Corporate Research Laboratories of SIEMENS, Munich, Germany):

Bilateral scientific co-operation, May 14–18, 2001.

Dr. Harald Höge, Cristian Geissler, Erdem Caglayan, Bernt Andrassy, Josef Bauer (Corporate Research Laboratories of SIEMENS, Munich, Germany):

Bilateral scientific co-operation, July 4–6, 2001.


Assoc. Prof. Dr. Zdravko Kačič, Silver Medal of University of Maribor.

Assoc. Prof. Dr. Zdravko Kačič and Digital Signal Processing Laboratory, Award for Achievements in Cooperation in International Research Projects, Faculty of Electrical Engineering and Computer Science, Maribor, Slovenia, Nov. 2001.

Institute of Power Engineering PE – 1

INSTITUTE OF POWER ENGINEERING

Head:

Prof. Dr. Ivan Zagradišnik Phone: +386 2 220 70 40


URL: http://www.me.feri.uni-mb.si/

The research work of the Institute of Power Engineering is divided into three main areas: electromagnetic devices; production, transmission and distribution of electrical energy; and power system control. The research on electromagnetic devices is focused on numerical methods. The research on electrical energy deals mainly with optimisation processes, reliability, and the quality of electric energy. Modernising control of power systems is the subject of the third topic.

The Institute of Power Engineering co-operates with many universities and institutes abroad: Elektrotehnički fakultet Zagreb, Croatia, Technische Universität Graz, - IGTE, Austria, Technical University of Budapest - Institute for electric machines, Hungary, Universität Stuttgart - Institute fur elektrische Machinen und Antriebsysteme and Institut für Theorie der Elektrotechnik, Germany, University of Wisconsin - Wisconsin Power Electronics Research Center Madison, USA, ETH Zürich - Institute for electric machines, Swiss, National Technical University of Athens, Institute for electrical engineering, Greece, Katholieke Universiteit Leuven - Institute for electric machines and drives, Belgium, University of Johannes Kepler Lienz - for control and drives – Austria, University of Lodz, Institute of Electrotechnical Machines and Transformers – Poland, University Sts. Cyril & Methodius, Faculty of Electrical Engineering Skopje – Macedonia.

PE – 2 Institute of Power Engineering

Electrical Machines

Laboratory Head:


Power Engineering Laboratory

Head: Assoc. Prof. Dr. Jože Voršič

Electromechanical Systems Control

Laboratory Head:

Prof. Dr. Drago Dolinar

Fundamentals and Theory of Electrotechnics

Laboratory Head:

Assoc. Prof. Dr. Igor T ičar

Institute of Power Engineering Head:


Applied Electromagnetics

Laboratoy Head:

Assoc. Prof. Dr. Mladen Trlep

Institute of Power Engineering PE – 3

Electrical Machines Laboratory

Head: Prof. Dr. Ivan Zagradišnik

Employees: Bojan Slemnik, MSc; Matej Gajzer, MSc; Florijan Leskovar, Miralem Hadžiselimović

Power Engineering Laboratory

Head: Assoc. Prof. Dr. Jože Voršič

Employees: Asst. Prof. Dr. Jože Pihler; Andrej Orgulan, MSc; Miran Horvat, MSc; Andrej Hanžič; Darko Koritnik; Marjan Stegne; Jurček Voh

Electromechanical System Control Laboratory

Head: Prof. Dr. Drago Dolinar

Employees: Prof. Dr. Bojan Grčar, Asst. Prof. Dr. Gorazd Štumberger, Asst. Prof. Dr. Jožef Ritonja, Dr. Oto Težak, Boštjan Polajžer, Aleksander Krašovec, Zlatko Strelec

Fundamentals and Theory of Electrotechnics Laboratory

Head: Assoc. Prof. Dr. Igor Tičar

Employee: Mitja Žnidarič, MSc

Applied Electromagnetics Laboratory

Head: Assoc. Prof. Dr. Mladen Trlep

Employees: Assoc. Prof. Dr. Anton Hamler, Dr. Marko Jesenik, Dr. Bojan Štumberger, Viktor Goričan, Jernej Ribič

PE – 4 Electrical Machines Laboratory

ELECTRICAL MACHINES LABORATORY

Head:


Phone: +386 2 220 72 40


RESEARCH PROJECTS


Applied project

Special motors for modern servo drives

Leader: Asst. Prof. Dr. Riko Šafarič Participants: Bojan Slemnik, MSc; Matej Gajzer; Miralem Hadžiselimović

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, Indramat elektromotorji, Proizvodnja električnih motorjev, d.o.o.

The object of this project is special synchronous motors with permanent magnets supplied by frequency converters build into modern servo drives for the main spindle drive of CNC machines, especially at high rotation.

The practical requests and demands of a motor’s pulsating torque result from regulations in connection with the quality of work materials in modern servo drives it is possible to fulfil the practical requests by choosing a suitable frequency converter but this must then be harmonized the electric motor with the chosen converter.

We want to achieve a compromise between the price of the motor which has to be competitive, and the quality of the motor, using special treatments for electric motors.

In the first stage of project we analyzed qualitatively the motor parameters as they are shapes of magnetic lamination, material and the geometrical properties of permanent magnets and windings sorts that have a decisive influence on the motor torque. The CAD solution of the program language Mathematica was developed.

At the same time the program module for 2-D parametric modelling of the synchronous motor

Electrical Machines Laboratory PE – 5

using software Ansys/EMAG was developed, making possible numerical estimation of the motor characteristics.

We developed parallel to this a software module to perform and analyze measurements of the synchronous motor with software LabView making possible automation of measurement procedure and so to do a comparison between numerical and measurement results.


Applied project

55-3567 Big hermetic motors

Leader: Prof. Dr. Ivan Zagradišnik Participants: Bojan Slemnik, MSc; Matej Gajzer; Miralem Hadžiselimović;

Mirko Petrovčič

Financed by: Ministrstvo of Economics and Rotomatika, d.o.o. Duration: 2000 – 2001

In the year 2001 we finished the work on project No 55-3567. At the end of the project in Rotomatika we build with regard to the results of previous research, an optimal lamination with outer diameter 160 and 223 mm. Using these laminations the prototypes of three-phase motors 0.5 HP, 0.75 HP, 1 HP and 1.8 Hp were built and also single phase motors of 1.5 HP for build in compressors Bitzer. On the lamination 223 mm we built the samples 11 kW for

PE – 6 Electrical Machines Laboratory

built in compressors ABS and 25 HP motors for built in compressors Bitzer. The research and correction of the slot bridges of the laminations which have an essential influence on the required characteristics of the motors were very important. All mentioned samples were measured and tested in compressors especially the influence of the cooling media (oil) on the insulation winding materials of the motors and on their life time.

Particular measurements of the motor samples, from which we found out the additional loses in the motors, were executed by practical use of electrical machines at FERI Maribor. The measurements were very pretentious and lasting in particular the influence of the stator winding displacement on the characteristics in the case of the 25 HP motor with the connection of a part section of winding during the start of the motor.

Measurement results generally have shown an influence on the chosen technology and materials and on the characteristics and good agreement proceeding theoretical research with the measurement data of the characteristics at the end of the project.

PUBLICATIONS

Ivan Zagradišnik, Elektromehanski pretvorniki: zapiski predavanj. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Ivan Zagradišnik, Bojan Slemnik, Električni rotacijski stroji: učbenik. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.


Ivan Zagradišnik, Matej Gajzer, “Analiza enofaznega motorja z obratovalnim kondenzatorjem,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 449-453.

Matej Gajzer, Ivan Zagradišnik, “Posodobitev merilnega mesta za električne rotacijske stroje,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 332-335.

Ivan Zagradišnik, Bojan Slemnik, “Rotating field in induction motor under consideration of anisotropy and cutting strains of steel sheets,” The first Slovenian-Polish Joint Seminar on Computational and Applied Electromagnetics, Maribor, Slovenia, Sept. 2001, pp. 15.

Electrical Machines Laboratory PE – 7

GUESTS AND VISITORS

Dr. Bernd Schnurr (Rexroth, Gruppe Bosch, Germany):

Scientific co-operation.

Prof. Dr. Stjepan Štefanko (University of Osijek, Croatia):


PE – 8 Power Engineering Laboratory

POWER ENGINEERING LABORATORY

Head:

Assoc. Prof. Dr. Jože Voršič

Phone: +386 2 220 70 50


RESEARCH PROJECTS

Current research projects Applied project

Local agenda – Environmental Protection Programme for Maribor

Leader: Assoc. Prof. Dr. Jože Voršič Participants: Dr. D. Rebolj; M. Bartol, MSc; A. Hanžič; A. Orgulan, MSc; M.

Horvat, MSc; B. Bizjak, MSc; D. Koritnik; I. Recer; R. Gostinčar; G. Vizovišek

Financed by: Municipality of Maribor, Institute of Environmental Engineering of Maribor, Tourist Association of Maribor, Slovenia

The project links activities of working groups, responsible for co-ordination of individual areas of environmental protection. The main objectives of our activities are the definition of preferential tasks and strategic guidelines for solving environmental protection problems for local areas. The working groups have full authority to propose new or additional research and analyses when it they are unable to make conclusions.

The working groups cover the following areas: water, waste, atmosphere, noise, emissions, municipal green areas, agriculture, industry, tourism, energy policy, IT, environment and health, economy and organisation. Our working group covers energy planning. In the framework of the Programme FERI organises seminars people, responsible for decision making in this field.

Power Engineering Laboratory PE – 9


CRP-KS 985-05/01 (V1-0480-01)

Research supporting the implementation of Kyoto Protocol – Target oriented research programme “Competitiveness of Slovenia 2001-2006”

Leader: Prof. Dr. Miha Tomšič Participants: Assoc. Prof. Dr. Jože Voršič, Andrej Hanžič Project Partners: FERI Maribor, ISPO d.o.o Slovenija, Javno podjetje

elektrogospodarstvo Slovenije, Umweltbundesamt Austria, KWI Architects Engineers Consultants, Austria

Financed by: Ministry of Environment and Physical Planning, Ministry of Education, Science and Sport of the Republic of Slovenia

The Slovenian Government adopted in November 2000 the Strategy and Short-Term Action Plan for Greenhouse Gases Emission Reduction. The Strategy defines targets, basic principles of emission reduction and a set of possible measures. The next steps and milestones of policy for prevention of climate changes (in accordance with the National Programme of Environmental Protection, Official Gazette of RS, no. 8/99) will be elaboration of the National Programme for Greenhouse Gases Emission Reduction, implementation of measurement and monitoring of their effects, and elaboration of national reports by the year 2002. The National Programme for Greenhouse Gases Emission Reduction will quantitatively define targets for each sector and provide detailed specification of measurements. Financial evaluation of the entire programme will also be included in the National Programme.

The core activity of the research work in the framework of this project is preparation of a methodology proposal for distribution of the emission reduction burden among the sectors. A tool for quantitative evaluation and analysis of potential national Kyoto strategies for Slovenia, and evaluation of individual sector strategies and instruments, will be developed on the basis of the upgrading and integration of existing computer models. An analysis of the worldwide development of new flexible Kyoto mechanisms and tools for the quantitative evaluation of the effects of their implementation will be the basis for the elaboration methodology proposal for implementation of these mechanisms in Slovenia.

The expected project results will be an important Professional support for operative preparation of the National Programme for Greenhouse Gases Emission Reduction.

The project team will prepare a survey of various sector approaches and implemented mechanisms for the distribution of emission reduction burdens among sectors for selected EU countries. An analysis of the anticipated development of common EU policy in this field will also be made. This will serve as a basis for the proposal of methodology and mechanisms for distribution of greenhouse emission burdens among the sectors in Slovenia.


Laboratory for high current tests

Leader: Andrej Pirih, MSc (Iskra Zaščite) Participants: Assoc. Prof. Dr. Jože Voršič; Dr. J. Pihler; Dr. V. Kumperščak; Dr. F.

Brešar; A. Orgulan, MSc; B. Bizjak, MSc; M. Horvat, MSc; M. Žnidarič, MSc; L. Mikola, MSc; D. Koritnik; A. Hanžič; M. Stegne; J. Voh; Research Group Protection and Systems; Research Group Iskra TECHNO

Financed by: Ministry of Economy of the Republic of Slovenia, Iskra Zaščite

Iskra Zaščite Ljubljana and FERI Maribor have started planning a new project, i.e. building a new laboratory for certification and accreditation. The laboratory will have two measurement locations that will satisfy all the needs of Slovenian industry and research institutes for high current tests and measurements. In Ljubljana a laboratory for tests using a surge current generator is under construction, while the ICEM laboratory in Maribor is equipped for tests with high DC and sinusoidal AC currents. Both laboratories are very specific electrical power consumers, and are potential sources of disturbances in the electrical power system and in their neighbourhoods.

The research & development phase of the project includes: impact of measurements and tests on neighbouring facilities, simulation of disturbances and impacts on electrical power systems, designing the earthing system, research of practical solutions regarding the laboratory set-up and possible tests, design of measurements for preparation of propagation of disturbances into the neighbourhood, impact of laboratories on the environment, planning and preparation of project of measurement procedures automation, and development of adequate software.

Energy Balance in the Municipality of Maribor for 2001 and computation of emissions

Leader: Assoc. Prof. Dr. Jože Voršič Participants: A. Hanžič; A. Orgulan, MSc; M. Horvat, MSc; M. Dornik (IE); G.

Černe, MSc (ZRMK)

Financed by: Municipality of Maribor, Slovenia

“Energy Balance in the Municipality of Maribor” is the basic document on the final energy consumption by individual kinds of energy, and quantities of primary energy, necessary for satisfying the energy requirements of the Municipality. The final energy consumption will serve as a basis for estimating the emissions of harmful substances. In addition to the energy balance for 2001, an estimation of greenhouse gas emissions from sectors of industry, traffic, energy consumption and energy transformation was also made for the same year.

The Energy Balance has been made in accordance with the EUROSTAT methodology, which is, starting from this year, also the official methodology for the Energy Balance of the


Republic of Slovenia. Thus the comparability of the Energy Balance in the Municipality of Maribor with the Energy Balance of the Republic of Slovenia is ensured.

Urban Renovation of the Historic City Centre

Leader: Igor Recer (IGRE d.o.o.) Participants: Assoc. Prof. Dr. Jože Voršič, A. Hanžič Project Partners: IGRE d.o.o. Maribor, IEI d.o.o. Maribor, FERI Maribor, OEGA

Consult d.o.o. Ljubljana, SI Consult d.o.o. Maribor, UM Inštitut za gospodarsko pravo Maribor, Agencija za tržno komuniciranje Maribor


Twenty years ago a ten-year Programme of Renovation for Maribor's Historic City Centre was adopted. The Programme was financed from the system source at the then Self-Management Housing Community. The implementation of this Programme was considered successful and was also presented to the Professional public in Slovenia and abroad. In recent years some new problems have emerged, which impede successful renovation of the city centre. The ownership structure has changed and it is impossible to restore the source of financing. It will be necessary to set new objectives for renovation and find financial sources, which will be the primary task of this project. The basic target of the project is to revitalise the historic city centre commercially and culturally. The Project Consortium has an intention to provide the city of Maribor, through Professionally executed renovation, a higher degree of tourist recognisability and enable marketing of the historic city centre as a trademark.

Industrial project

New Motor Starter

Leader: Assoc. Prof. Dr. Jože Pihler Participants: Assoc. Prof. Dr. Jože Voršič, Dr. I. Tičar, D. Koritnik, A. Hanžič, M.

Stegne, A. Lovrenčič (ELA), J. Jeraj (Orkom), J. Varga (Vitalner).

Financed by: ELA Slovenske Konjice, Vitalner d.o.o., Slovenia

In the year 2001 the method of mechanical fixing for the starter was modified according to the requirements of European customers. The electromagnetic drive was modified according to the requirements of the American market, i.e.110 V and 230 V, 60 Hz. The imperfections detected during the prototype tests were eliminated and new testing of the first manufactured series of products has been performed in compliance with IEC 60947-41 subclause 9.3.1:

Test sequence 1:


Temperature rise test - IEC 60947-4-1 subclause 9.3.3.3 Operation and operational limits test - IEC 60947-4-1 subclause 9.3.3.1 in 9.3.3.2 Dielectric test - IEC 60947-4-1 subclause 9.3.3.4

Test sequence 2: Rated Making & Breaking capacity test- IEC 60947-4-1 subclause 9.3.3.5 Conventional operation test - IEC 60947-4-1 subclause 9.3.3.6

Test sequence 3: Short circuit operation test - IEC 60947-4-1 subclause 9.3.4

Test sequence 4: Ability of conducting overload current test - IEC 60947-4-1 subclause 9.3.5

Test sequence 5: Mechanical properties of connections test – IEC 60947-1 subclause 8.2.4

Patent applications were submitted in some foreign countries (European Union, USA, Russia, Japan, India, etc.), and the technical documentation was re-arranged accordingly.


NNE5-2001-0075 DISPOWER – Distributed Generation with High Penetration of Renewable Energy Sources (5 framework programme; project in the approval procedure – final evaluation)

Leader: Assoc. Prof. Dr. Jože Voršič Participants: A. Hanžič; A. Orgulan, MSc; M. Horvat, MSc Project Partners: Institut für Solare Energieversorgungstechnik Wien, Austria

Financed by: European Union

The process for deregulation of the European energy market will inevitably lead to the appearance of new electricity generators with their production based upon distributed generation units.

Improvements in the field of power system control and development of electronic components and telecommunication systems, especially for the purpose of remote control, will make it possible to improve the generation and transmission of electricity on the liberalised market.

The following activities are envisaged in the project: • Elaboration of strategy and concept of stability of distribution network and control

systems (distributed generation);


• Preparation of security standards and standards for power quality in networks with decentralised energy sources, improvement possibilities, and requirements of decentralised voltage transformers and decentralised generation units;

• Development of adequate design models and development of efficient penetration of distributed generation into regional and local networks;

• Design of internet based information systems to support improvement in communication procedures, power system control and electricity trading;

• Building of test system for testing and further development of distributed generation systems;

• Load flow modelling.

Slo-A19/2002 Virtual Electromagnetic Laboratory and Web-based Distance Learning

Leader: Assoc. Prof. Dr. Igor Tičar Participants: Dr. J. Pihler; Dr. A. Hamler; A. Orgulan, MSc; M. Žnidarič, MSc;

Prof. Dr. Kurt Preis (IGTE) Project Partners: Institut für Grundlagen und Theorie der Elektrotechnik (IGTE), TU

Graz, Austria


The project will intensify the successful co-operation between Laboratory of Applicative Electrical Engineering of FERI and Institut für Grundlagen und Theorie der Elektrotechnik (IGTE) of TU Graz. Both institutions have successfully co-operated for many years in the field of numerical solving electromagnetic field problems, which is evident from several commonly published papers. This co-operation has been in the last couple of years especially intensive and successful in the field of computer supported educational programmes for the subjects Principles of Electrical Engineering and Theoretical Electrical Engineering. The solving of applicative problems for industry using previously developed program tools has also been very successful. Further upgrading of existing, and the design of new program tools will include development of new pre-processors for planar and rotationally symmetrical electromagnetic problems, pre-processors for planar problems in polar co-ordinates for electric machines, two and three dimensional program packages EleFAnT2D and EleFAnT3D. In addition to this, some examples of a virtual electromagnetic laboratory will be developed to improve practical exercises for the subject Principles of Electrical Engineering. Procedures of computer animation of electromagnetic phenomena will also be developed.

The institutes at TU Budapest and TU Stuttgart are also included in this co-operation. The Austrian partner also co-operates with the University of Bath (UK) and University of Genoa (I) in the EU project Teleteaching and distance education and in INCO COPERNICUS project P.nr. 15CT960703.




J2-0130-0796-00 Impact of Voltage Fluctuation on Generator Life Time

Leader: Assoc. Prof. Dr. Jože Voršič Participants: Dr. J. Pihler; Dr. V. Kumperščak; Dr. M. Logar; A. Orgulan, MSc; M.

Žnidarič, MSc; M. Horvat, MSc; B. Bizjak, MSc; D. Koritnik

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia Duration: 3 years

The impacts of big electric arc furnaces are represented as disturbances – voltage fluctuations – in the electric power system. A synchronous generator operating in the vicinity of the source of disturbances to a large extent eliminates such voltage fluctuations. Unfortunately, such a mode of operation can have a negative impact on the generator' lifetime.

The impacts of voltage fluctuations on synchronous generator operation can be divided into two types of problems. The first are problems of stator thermodynamics and rotor winding, while the second are problems related to the impact on the mechanical parts of machines (bearings). In dynamic operations, the time constants of heating and cooling are important for the determination of thermodynamic conditions. These two time constants are not constant for the entire machine. Excessive heating of certain parts of the machine can lead to gradual destruction of insulation and consequently to the reduction of machine life time.

Applied project

0203/1-01/2001-3.6 Elaboration of Comparative Study on Electrical Power Quality in the European Union

Leader: Andrej Orgulan, MSc Participants: Assoc. Prof. Dr. Jože Voršič; B. Bizjak, MSc; Dr. J. Pihler; D.

Koritnik; Dr. M. Logar; A. Hanžič; M. Stegne; M. Horvat, MSc; M. Žnidarič, MSc

Financed by: Energy Agency of the Republic of Slovenia Duration: 1 year

Electrical power has become, according to the definitions of the Slovenian Energy Act, a tradable commodity, the quality of which should be monitored. The criteria for voltage quality is defined in the SIST EN 50160 standard, while the quality of electrical power sometimes


also requires the monitoring of electrical current parameters.

The objective of the project is to perform measurements and to elaborate a report on the quality of electrical power in transmission and distribution networks. For the purpose of this project we had to analyse the conditions in the Slovenian transmission network and some previously elaborated studies dealing with similar issues. The minimum set of measurement points has been defined. In the next step the measurement points were selected, individually for each Slovenian region. In the first part of the project the measurements of electrical power quality have been performed at the voltage levels 110 kV, 20(10) kV and 400 V. The presentation and the analysis of results are very demanding tasks due to the extent of the measurements – measurements with the duration of one week have to be performed on various locations around the country – and consequently due to the large amount of measurement results, which have to be clear and should not be misleading.

The project results will serve as a basis for determination of the measurement points of the future power quality monitoring system in the Slovenian transmission and distribution systems, which calls for well argumented evaluation and presentation of the obtained results.

Industrial projects

Low Voltage Distribution Panels for Outdoor Use

Leader: Assoc. Prof. Dr. Jože Pihler Participants: Assoc. Prof. Dr. Jože Voršič, D. Koritnik, A. Hanžič, M. Stegne

Financed by: Elektro Celje, Elum Zvone Aleš s. p., Slovenia Duration: 1 year

Adaptation of low voltage distribution panels type NN-400 and low voltage protection panels for concrete pole mounted transformers for outdoor use, has been made to comply with the requirements of IEC 60439-1 standard. The complete type testing comprising the following tests has been made: Temperature rise test (IEC 60439-1 subclause 8.2.1); Dielectric properties test (IEC 60439-1 subclause 8.2.2.4); Protective earth circuit test (IEC 60439-1 subclause 8.2.4.1); Creepage and clearance test (IEC 60439-1 subclause 8.2.5); Degree of mechanical protection test (IEC 60529 subclause 7.4 in 8.3.1); Mechanical operation test (IEC 60439-1 subclause 8.2.6).


Cable Accessories and Heat Shrinkable Tubing

Leader: Darko Koritnik Participants: Dr. J. Pihler, M. Stegne

Financed by: PE. TE. ZE. d.o.o. Ljubljana, Slovenia Duration: 1 year

Heat shrinkable tubing CFM CFW, manufactured by CANUSA EMI is a relatively new product, used in electrical power facilities. The manufacturer has performed several tests in accordance with Canadian and German standards. On the basis of these measurements and studying of the above mentioned standards the compliance with Slovenian and international IEC standards had to be verified in order to confirm the adequacy of these product for their entry into the Slovenian market.


The JOINT project - National CO2 Emission Baselines and Additional Projects – A Pilot case Study of the Slovenian Energy System by Means of SESAM

Leader: M. Seliškar (ISPO d.o.o.) Participants: A. Hanžič, Assoc. Prof. Dr. Jože Voršič Project Partners: Eco Consult Denmark, ISPO d.o.o. Consulting for Business

Ljubljana, EGS Elektrogospodarstvo Slovenije and FERI Maribor, ZRMK d.d. Ljubljana, Slovenia

Financed by: Ministry of Environment and Physical Planning, Slovenia Duration: 2 years

On the basis of methods and procedures for the SESAM model, a study of modelling the emissions of greenhouse gases from industrial, general energy consumption and electricity generation sectors has been elaborated. The emissions for the entire Slovenian territory, divided by the above mentioned sectors into three climate zones, have been modelled. The purpose of the project was to investigate the possibilities of Slovenia making its contribution to the global reduction of greenhouse gases emissions through the application of mechanisms for clean development and emission trading with participation in the Joint Implementation (JI) Projects.

Systems of Protection Against Life-Threatening Touch and Step Voltage During Earth Faults in High Voltage Networks of Ore and Coal Mines, and a Proposal of Efficient Selective Protection

Leader: Assoc. Prof. Dr. Jože Voršič


Participants: Dr. J. Pihler; M. Horvat, MSc Project Partners: Faculty of Electrical Engineering, University of Tuzla, Bosnia and

Herzegovina


The project is a part of an intergovernmental programme of scientific co-operation between the Republic of Slovenia and Bosnia and Herzegovina. The subject of the project is a method of dynamic modelling of electrical power systems during earth faults. The dynamic model has been developed as an upgrade of the EMTDC program tool. The practical simulation has been made on the basis of the 6 kV network of the surface mine “Gračanica” in Gatsko, Bosnia and Herzegovina. Simulations of various possible earth fault cases have been used as a background for selecting the protection system against life threatening touch and step voltage that appear during earth faults. Practical measurements for verification of simulations have also been performed.

PUBLICATIONS

Jože Pihler, Alojz Lovrenčič, “New electromagnetic contactor,” Electr. power syst. res., Vol. 59, pp. 83-88, 2001.

R. Stephen, M. Gaudry, J. Fernandes, S. Hoffmann, Franc Jakl, R. Kimata, R. Kleveborn, L. Larsen, G. Miroševič, Y. Motlis, Y. Ojala, H. Pohlmann, T. O. Seppa, L. Varga, M. A. Vincent, “Real time monitoring,” Electra, No. 197, pp. 34-47, Aug. 2001.

Igor Tičar, Jože Pihler, Oszkár Bíró, Kurt Preis, “Partial discharges in insulation of medium voltage systems,” Compel, Vol. 20, No. 2, pp. 473-481, 2001.

Samo Ulaga, Jože Flašker, Boštjan Zafošnik, Iztok Ciglarič, “Optimizacijski postopek v procesu zasnove zobnikov,” Stroj. vestn., Vol. 47, No. 7, pp. 286-299, 2001.


Jože Pihler, “Preskušanje nizkonapetostnih naprav in aparatov,” ER, Vol. 2, No. 4, pp. 18-20, 2001.

Jože Flašker, Samo Ulaga, “Možnosti rednega in izrednega študija vzdrževalcev na Fakulteti za strojništvo Univerze v Mariboru,” Vzdrževalec, No. 83, pp. 18-19, Oct. 2001.


Andrej Hanžič, Jože Voršič, “Gorivne celice - pogonsko sredstvo prihodnosti,” EGES, Energ. gospod. ekol. Slov., Vol. 5, No. 2, pp. 108-111, 2001.

Andrej Orgulan, Jože Voršič, “Vpliv razsvetljave na okolje,” EGES, Energ. gospod. ekol. Slov., Vol. 5, No. 5, pp. 86-90, Sept. – Nov. 2001.

Jože Voršič, Andrej Hanžič, “Gorivne celice za pogon avtomobilov in proizvodnjo električne energije,” EGES, Energ. gospod. ekol. Slov., No. 3, pp. 111-113, June – Aug. 2001.

Krešimir Bakič, Ferdinand Gubina, Rajko Pirnat, Marko Senčar, Jože Voršič, Anton Ogorelec (ed.), Slovenski elektrotehniški slovar, Področje Elektroenergetika, Slovar izrazov za trg z električno energijo. Ljubljana, Slovenia: SLOKO-CIGRÉ 2001.

Alojz Lovrenčič, Jože Pihler, “Preklopni element zvezda-trikot,” Patent No. SI 20293 A, Patent Request No. P-9900062, Ljubljana, Urad Republike Slovenije za intlektualni lastnino, date of submission Mar. 24, 1999.

Boris Bizjak, Jože Voršič, “Increasing efficiency of hydro power plants by means of active power filters,” 18th World energy congress Energy markets: The challenges of the new millennium, Buenos Aires, Argentina, Oct. 2001, 8 pp.

Dušan Gabriel, Jiøí Plešek, Miran Ulbin, “Large displacement frictionless contact algorithm by the pre-doscretization penalty method,” ECCM-2001: solids, structures and coupled problems in engineering, Krakow, Poland, 15 pp.

Karl Gotlih, “Kelvin-Voight`s rheological material model for simulation of tensile loaded thread,” 1st Autex conference Tex-Ed & R 2001: strategies for the new millenium with special session on Information technology in textile education and research, Povoa de Varzim, Portugal, June 2001, Vol. 2, pp. 103-109.

Andrej Hanžič, Andrej Polajnar, Andrej Predin, Jože Voršič, “New technology for exploatation of wind energy in Slovenia,” Wind power for the 21st century: the challenge of high wind power penetration for the new energy markets, Kassel, Germany, Sept. 2001, 5 pp.

Andrej Jakl, Marjan Krašna, Franc Jakl, Darko Goričanec, “Developing information systems - technical systems,” The IASTED International Symposia Applied Informatics, Innsbruck, Austria, Feb. 2001, pp. 631-636.

Franc Jakl, Andrej Jakl, Miro Žunec, “Adiabatic heating of bare conductors of overhead transmission lines with consideration of temperature dependent physical magnitudes,” Innovative engineering for today's environment, Yeoville, South Africa, 6 pp.


Jože Pihler, Igor Tičar, Jože Voršič, Oszkar Biro, Kurt Preis, “Design of SF6 switchgear components by means of electric field calculations,” 5th WSES International Conference on Circuits, Systems, Communications and Computers (CSCC 2001), 3rd WSES International Conference on Mathematics and Computers in Physics (MCP 2001), 3rd WSES International Conference on Mathematics and Computers in Mechanical Engineering (MCME 2001), Rethymno, Greece, July 2001, pp. 7801-7806.

Ivo Uglešić, Sandra Hutter, Miroslav Krepela, Božidar Filipović-Grčić, Franc Jakl, “Transients due to switching of 400 kV shunt reactor,” International Conference on Power Systems Transients, Rio de Janeiro, Brazil, June 2001, pp. 475-480.

Miran Ulbin, Boštjan Zafošnik, Zoran Ren, Jože Flašker, “Numerical determination of mixed mode stress intensity factor,” 2nd International Conference on Fracture and Damage Mechanics, Milano, Italy, Sept. 2001, pp. 263-268.

Boštjan Zafošnik, Miran Ulbin, Zoran Ren, Jože Flašker, “Analyses of crack propagation on CTS specimen,” International Conference on Fracture and Damage Mechanics, Milano, Italy, pp. 465-470.

Boštjan Zafošnik, Miran Ulbin, Zoran Ren, Jože Flašker, “Comparison of different techniques for determination of mixed mode stress intensity factors on CTS specimen,” The sixth International conference on biaxial/multiaxial fatigue & fracture, Lisbon, Portugal, June 2001, pp. 719-726.

Matjaž Šraml, Iztok Potrč, Miran Ulbin, Janez Stupan, “Computer aided analysis and optimization of the forging process,” Formulations and constitutive laws for very large strains, Euromech Colloquiun 430, Praga, Czech Republic, Oct. 2001, pp. 50-51.

Breda Cestnik, Franc Jakl, “Pristup rješavanja problematike elektromagnetskog zračenja kod nadzemnih vodova u Sloveniji,” peto savjetovanje CIGRÉ, Cavtat, Croatia, 2001, pp. 27-36.

Franc Jakl, Krešimir Bakić, Andrej Jakl, “Sodobni vodniki za nadzemne vode - kdaj v Sloveniji?,” peto savjetovanje CIGRÉ, Cavtat, Croatia, 2001, pp. 101-107.

Samo Ulaga, Jože Flašker, “Model izobrazbe održavatelja na Sveučilištu u Mariboru,” Zbornik radova, Zagreb, Croatia, pp. 159-165.

Franc Jakl, Miro Žunec, Andrej Jakl, “Utjecaj zagrijavanja golih vodiča na provjes kod nadzemnih vodova,” V. Savjetovanje Bosanskohercegovačkog komiteta CIGRÉ, Neum, Bosnia and Herzegovina, Sept. 2001, pp. 22-7 - 22-10.


Nermin Sarajlić, Tatjana Konjić, Jože Voršič, Andrej Orgulan, “Povećanje gubitka zbog viših harmonika u mreži,” V. Savjetovanje Bosanskohercegovačkog komiteta CIGRÉ, Neum, Bosnia and Herzegovina, Sept. 2001, pp. 36-32 - 36-35.

Tatjana Konjić, Nermin Sarajlić, Jože Voršič, “Mjerenje podharmonijskog kolebanja napona,” V. Savjetovanje Bosanskohercegovačkog komiteta CIGRÉ, Neum, Bosnia and Herzegovina, Sept. 2001, pp. 36-36 - 36-40.

Franc Jakl, Miro Žunec, “Porazdelitev tokovne gostote v plasteh golih vodnikov za nadzemne vode z upoštevanjem kožnega učinka,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 479-482.

Franc Jakl, “Aktivnosti na področju sprejemanja okoljevarstvenih standardov s pristopom LCA pri nadzemnih vodih v luči standardov serije ISO 14040,” Peta konferenca slovenskih elektroenergetikov, Bled, Slovenia, May 2001, Part 1, pp. 22-75 - 22-82.

Miran Horvat, Marjan Logar, Jože Voršič, “Verjetnostni izračun pretokov moči v tržnih razmerah,” Peta konferenca slovenskih elektroenergetikov, Bled, Slovenia, May 2001, Part 2, pp. 38-35 - 38-42.

Franc Jakl, Krešimir Bakić, Andrej Jakl, “Sodobni vodniki za nadzemne vode - kdaj v Sloveniji?” Peta konferenca slovenskih elektroenergetikov, Bled, Slovenia, May 2001, pp. 22/7-22/14.

Davorin Korpar, Moma Stojkovič, Jože Pihler, “Univerzalni kabel za srednjenapetostno omrežje,” Peta konferenca slovenskih elektroenergetikov, Bled, Slovenia, May 2001, Part 1, pp. 21-19 - 21-25.

Jože Pihler, Igor Tičar, Peter Kitak, Mitja Kos, “Izbira elementov SF[spodaj]6 stikalne naprave s pomočjo izračuna električnega polja,” Peta konferenca slovenskih elektroenergetikov, Bled, Slovenia, May 2001, Part 1, pp. 13-33 - 13-39.

Igor Tičar, Jože Pihler, Aleš Žuželj, “Načrtovanje indikatorjev napetosti v srednjenapetostnih stikalnih napravah,” Peta konferenca slovenskih elektroenergetikov, Bled, Slovenia, May 2001, Part 1, pp. 13-1 - 13-7.

Andrej Hanžič, Jože Voršič, “Zasnova alternativnih virov energije v Sloveniji,” deseto Mednarodno posvetovanje Komunalna energetika, Maribor, Slovenia, May 2001, 13 pp.

Miran Horvat, Marjan Logar, Jože Voršič, “Načrtovanje elektroenergetskega sistema ob nedoločenosti trga,” deseto Mednarodno posvetovanje Komunalna energetika, Maribor, Slovenia, May 2001, 10 pp.


Andrej Hanžič, Darko Koritnik, Jože Pihler, Jože Voršič, “Simulacija ZnO prenapetostnega odvodnika s programom PSCAD/EMTDC,” deseto Mednarodno posvetovanje Komunalna energetika, Maribor, Slovenia, May 2001, 8 pp.

Karl Gotlih, Karel Jezernik, “Izračun Jacobijeve matrike z uporabo Kroneckerjevih produktov,” Kuhljevi dnevi '01, Portorož, Slovenia, Sept. 2001, pp. 105-112.

Franc Jakl, “Vpliv segrevanja vodnikov na povese pri nadzemnih vodih v pogojih realizacije trga z električno energijo,” 22. posvetovanje o močnostni elektrotehniki in sodobnih električnih instalacijah, Kotnikovi dnevi, Radenci, Slovenia, Mar. 2001, pp. 43-51.

Andrej Orgulan, Darko Koritnik, Jože Voršič, “Novosti s področja visokonapetostnih svetlobnih cevi,” 22. posvetovanje o močnostni elektrotehniki in sodobnih električnih instalacijah, Kotnikovi dnevi, Radenci, Slovenia, Mar. 2001, pp. 103-112.

Darko Koritnik, Jurček Voh, Jože Voršič, “Kontrola lovilnega sistema za strele,” 22. posvetovanje o močnostni elektrotehniki in sodobnih električnih instalacijah, Kotnikovi dnevi, Radenci, Slovenia, Mar. 2001, pp. 123-136.

Darko Koritnik, Jože Voršič, “Računalniško podprto projektiranje lovilnega sistema za zaščito pred udarom strele,” Šesti mednarodni seminar Zaščita pred delovanjem strele in pred prenapetostmi, Maribor, Slovenia, Apr. 2001, 5 pp.

Jože Voršič, “Energetski viri,” Zbornik referatov, Maribor, Slovenia, pp. 17-35.


Jože Voršič, Boris Bizjak, “Uticaj potrošača na oblik napona: mjerenja, analiza i otklanjanje smetnji,” lecture at the University of Tuzla, Faculty of Electrical Engineering, Tuzla, Bosnia and Herzegovina, Jan. 15, 2001.

Samo Ulaga, “Leonardo da Vinci project proposal,” invited speech at the European Federation of National Maintenance Societies (EFNMS) Council, Copenhagen, Denmark, May 5, 2001.

Franc Jakl, Miro Žunec, Andrej Jakl, “Heating calculation of OPGW OPTOFLEX cable under adiabatic state conditions,” a talk at the 24th meeting of Cigre SC22 WG22.12, Stockholm, Sweden, May 15–16, 2001.



Assoc. Prof. dr. Jože Voršič:

Editor of the conference proceedings “Tenth International Expert Meeting Power Engineering”, Maribor, Slovenia, May 15–17, 2001.

Assoc. Prof. dr. Jože Voršič: Responsible editor at the expert meeting “Energy for Tomorrow's Maribor – Geothermal energy”, Maribor, Slovenia, Nov. 16, 2001.

Assoc. Prof. dr. Jože Voršič: Member of editorial board of electrotechnical magazine ER.

Andrej Orgulan, MSc: Editor of magazine “Svetlobna tehnika”, Slovenian Lighting Association, Maribor, Slovenia, 2001.

Andrej Orgulan, MSc: Editor of the proceedings of Slovenian Lighting Association, Maribor, Slovenia, 2001.


Assoc. Prof. Dr. Jože Pihler: Visit to the CTI Akkreditierte Prüfanstalt für Elektrotechnik: comparison of the European and IEC legislation, measurement procedures and certificating, co-operation with ICEM laboratory, Vienna, Austria, Jan. 15, 2001.

Assoc. Prof. Dr. Jože Voršič: Visit to the international workshop “ElectroMagnetic Compatibility (EMC)”, Augsburg, Germany, March 13–15, 2001.

Andrej Orgulan, MSc: Visit to the Lighting Technology Laboratory in SITEC, Trunrent: presentation of the laboratory, lighting technology centre and manufacturing of lamps; talks about the co-operation in the fields of research and education, Turnrent, March 22–23, 2001.

Darko Koritnik: Visit to the 4th VDE/ABB Blitzschutztagung workshop: the main topic was protection against lightning and consequences of overvoltage –


changes in European standardisation and legislation; discussion on technical solutions of overvoltage protection at the Kum radio and television transmitter, Neue-Ulm, Germany, Nov. 8–9, 2001.

GUESTS AND VISITORS

Assoc. Prof. Dr. Enver Delamič (University of Tuzla, Faculty of Electrical Engineering, Bosnia and Herzegovina):

Lecture on dynamic conditions in high voltage networks of mines.

Prof. Dr. Ruslan Borisov (Technical University of Moscow, Russia):

Visit of director of the “RPC ELECTRICAL ENGINEERING: RESEARCH & PRACTICE” institute: lecture on protection against lightning and co-operation in software development.

PE – 24 Electromechanical Systems Control Laboratory

ELECTROMECHANICAL SYSTEMS CONTROL LABORATORY

Head:

Prof. Dr. Drago Dolinar

Phone: +386 2 220 70 70


RESEARCH PROJECTS



RR-61-2596 System for control, protection and local automation in power systems

Leader: Prof. Dr. Bojan Grčar Participants: Prof. Dr. Drago Dolinar, Asst. Prof. Dr. Gorazd Štumberger, Asst.

Prof. Dr. Jožef Ritonja, Dr. Oto Težak, Boštjan Polajžer

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, Iskra SYSEN

This project considers the practical implementation of different protection and control algorithms. Besides some new concepts in transformer protection, turn-to-turn faults are the focus of our current research. This fault type represents a great challenge for existing relays since they are unable to recognize turn-to-turn faults in the early development stage. Based on a great number of measured samples on the laboratory power transformer we hope to first develop an appropriate model describing this fault type with sufficient accuracy. Obtained deeper knowledge will be later used to improve the sensitivity of protection algorithms.

Modelling, analysis and control of Linear Synchronous Reluctance Motor (LSRM)

Leader: Prof. Dr. Drago Dolinar Participants: Asst. Prof. Dr. Gorazd Štumberger, Prof. Dr. Bojan Grčar, Prof. Dr.

Kay Hameyer, Dr. Bojan Štumberger

Electromechanical Systems Control Laboratory PE – 25

Financed by: Electromechanical Systems Control Laboratory

The subject under investigation was the modelling and control design of high performance drive using Linear Synchronous Reluctance Machine (RSLM). A nonlinear dynamic model of the LSRM has been developed, verified and validated. The model contains a magnetically nonlinear and anisotropic model of the LSRM iron core and the position and current dependent characteristics of the thrust and friction force. All required characteristics have been determined experimentally.

Experimental system: Linear synchronous reluctance servodrive.



J2-7611-0796-99 Electromagnetic Devices - Basic Computational Methods

Leader: Prof. Dr. Božidar Hribernik Participants: Prof. Dr. Drago Dolinar, Assoc. Prof. Dr. Mladen Trlep, Assoc. Prof.

Dr. Anton Hamler, Asst. Prof. Dr. Gorazd Štumberger, Dr. Marko Jesenik, Dr. Bojan Štumberger



Our research dealt with the modelling and control of electrical machines. Determination of some new, improved dynamic models of electrical machines and methods for determining machine parameters was the main task of the modelling. The modified models of linear induction and reluctance machines have been used successfully in designing some new high-performance machine operation control.

J2-0800-796-00 Local automation and unit protection in power systems




In this basic research project dynamic power system modelling, control and unit protection were discussed. We claim that network modelling can be performed equally based on instantaneous state variables or by using dynamic phasor quantities. Analysis tools for the interaction of power system transients with protection operation have been developed. In testing phase there are new protection algorithms based on the analytical signal processing methods applied to the power transformers and transmission lines.

Applied project

L2-0796-0796-99 Active Magnetic Bearings

Leader: Prof. Dr. Drago Dolinar Participants: Prof. Dr. Bojan Grčar, Assoc. Prof. Dr. Peter Cafuta, Asst. Prof. Dr.

Gorazd Štumberger, Asst. Prof. Dr. Jožef Ritonja, Dr. Oto Težak, Boštjan Polajžer, Prof. Dr. Kay Hameyeer

Financed by: Ministry of Eductaion, Science and Sport of the Republic of Slovenia Duration: 3 years

Resulting from this research project an experimental system of active magnetic bearings was developed. The design of magnetic bearings was achieved in cooperation with the KU Leuven, ESAT/ELEN, Professor K. Hameyer, while the design of the rotor (system) shaft was achieved in cooperation with the KU Leuven, MECH/PMA, Professor W. Heylen. The development of the power supply, electronics and the control is based on our knowledge and experiences. Magnetic bearing force was measured in order to determine the mathematical model by analytical continuous functions. Based on the derived mathematical model, a control design was implemented. The improvement of the static and dynamic system


performances was established. We have realized the design as well as manufacturing of the experimental system of active magnetic bearings. The modular type of the realization and the user friendly control desk make it possible to use the system in applied and theoretical research as well as for educational purposes.

Prototype of the active magnetic bearings.

Industrial project

Protection of Power Transformers Tertiary Windings



Financed by: Eles, Slovenia Duration: 2 years

This study discusses the problem of power transformers (400/110/31.5 kV in 220/110/10.5 kV) tertiary winding protection in special cases where tertiary winding is also used for station power supply. Such configuration makes the protection system design and settings difficult under some operating conditions and even the transformer itself can be threatened. Based on dynamic model short circuit and turn-to-turn analyses, relay systems and effective over-voltage protection are described in the project.

PUBLICATIONS

Bojan Grčar, Peter Cafuta, Ludvik Kumin, “Exact tracking by dynamic field-weakened PMAC servodrive,” IEEE trans. energy convers., Vol. 6, No. 1, pp. 38-42, 2001.


Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, Anton Hamler, “Cross magnetization effect on inductances of linear synchronous reluctance motor under load conditions,” IEEE trans. magn., Vol. 37, No. 5, pp. 3658-3662, Sept. 2001.

Boštjan Polajžer, Gorazd Štumberger, Drago Dolinar, Kay Hameyer, “Analiza laboratorijske izvedbe radialnega aktivnega magnetnega ležaja,” Electrotechnical Review, Vol. 68, No. 1, pp. 64-69, 2001.

Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, “Eksperimentalna metoda določanja induktivnosti linearnega sinhronskega reluktančnega motorja z uporabo vodenega napetostnega pretvornika,” Electrotechnical Review, Vol. 68, No. 1, pp. 32-38, 2001.

Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, “Nelinearni model linearnega sinhronskega reluktančnega motorja: analiza stroja,” Electrotechnical Review, Vol. 68, No 5, pp. 247-252, 2001.

Oto Težak, “Intelligent systems evaluation methodology,” International Summer School of Automation, Maribor, Slovenia, June 2001, pp. 160-168.

Peter Cafuta, Žarko Čučej, Bojan Grčar, “Discrete boundary layer current control for VSI - IM drive,” The IEEE Joint International Conference on Control Applications & International Symposium on Intelligent Control CCA/ISIC '01, México City, Mexico, Sept. 2001, pp. 339-344.

Bojan Grčar, Peter Cafuta, Gorazd Štumberger, Aleksandar M. Stanković, “Pulsating torque reduction for permanent magnet AC motors,” The IEEE Joint International Conference on Control Applications & International Symposium on Intelligent Control CCA/ISIC '01, México City, Mexico, Sept. 2001, pp. 288-293.

Jožef Ritonja, Drago Dolinar, Bojan Grčar, “Simple adaptive control for stability improvement,” The IEEE Joint International Conference on Control Applications & International Symposium on Intelligent Control CCA/ISIC '01, México City, Mexico, Sept. 2001, pp. 29-34.

Rudi Prosen, Miro Milanovič, Drago Dolinar, “Unity IDF correction for AC to DC converter based on modulation strategy,” ISCAS 2001, pp. III-389 - III-392.

Bojan Štumberger, Gorazd Štumberger, Drago Dolinar, Anton Hamler, Mladen Trlep, “Evaluation of saturation and cross-magnetization effects in interior permanent magnet synchronous motor,” The IEEE industry applications conference, pp. 2563-2562.


Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, “Position and current dependent flux linkages, thrust and friction force of linear synchronous reluctance motor,” The IEEE industry applications conference, pp. 2310-2317.

Bojan Štumberger, Viktor Goričan, Gorazd Štumberger, Anton Hamler, Mladen Trlep, Marko Jesenik, “Accurateness of posterior iron loss calculation in electrical machines by using different iron loss models,” Soft Magnetic Materials Conference, Bilbao, Spain, Sept. 2001, pp. C-14.

Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, “Magnetically nonlinear and anisotropic iron core model of synchronous reluctance motor,” Soft Magnetic Materials Conference, Bilbao, Spain, Sept. 2001, pp. G-05.

Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, Anton Hamler, “Calculation of two-axis nonlinear dynamic linear synchronous reluctance motor model parameters by finite element method,” COMPUMAG, Vol. 2, pp. 154-155.

Bojan Štumberger, Gorazd Štumberger, Anton Hamler, Drago Dolinar, Mladen Trlep, “Analysis of saturation and cross magnetization effects in flux-weakened interior permanent magnet synchronous motor,” COMPUMAG, Vol. 4, pp. 52-53.

Boštjan Polajžer, Drago Dolinar, Gorazd Štumberger, Oto Težak, Kay Hameyer, “Analysis of the laboratory implementation of a radial active magnetic bearning,” International symposium on electromagnetic fields in electrical engineering, Krakow, Poland, Sept. 2001, pp. 599-604.

Gorazd Štumberger, Drago Dolinar, “Določitev sil in magnetnih sklepov linearnega sinhronskega reluktančnega motorja z vodenim napetostnim pretvornikom,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 413-416.

Gorazd Štumberger, Drago Dolinar, “Križne sklopitve v linearnem sinhronskem reluktančnem motorju povzročene z magnetno anizotropnim obnašanjem železnega jedra,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 417-420.

Oto Težak, Boštjan Polajžer, Gorazd Štumberger, Drago Dolinar, “Aproksimacija sile magnetnega ležaja,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 459-461.

Peter Ljušev, Drago Dolinar, Gorazd Štumberger, “Vpliv magnetnega nasičenja na navor regularnega asinhronskega stroja,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 401-404.


Boštjan Polajžer, Drago Dolinar, Kay Hameyer, “Analiza elastične gredi laboratorijske izvedbe aktivnih magnetnih ležajev,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 463-466.

Matej Toman, Drago Dolinar, Gorazd Štumberger, “Določitev parametrov sinhronskega motorja s trajnimi magneti s krmilnim sistemom dSPACE,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 405-408.

Oto Težak, Gorazd Štumberger, Boštjan Polajžer, Drago Dolinar, “Uporaba evolucijskega računanja pri aproksimaciji ploskev,” 4. mednarodna multi-konferenca Informacijska družba IS '01, Ljubljana, Slovenia, Oct. 2001, pp. 33-35.

Boštjan Polajžer, Drago Dolinar, Gorazd Štumberger, Kay Hameyer, “Force calculation of the laboratory implementation of a radial active magnetic bearing,” The first Slovenian-Polish Joint Seminar on Computational and Applied Electromagnetics, Maribor, Slovenia, Sept. 2001, pp. 5.


Drago Dolinar, “Electrical engineering,” a lecture for the French students of Electrical Engineering at the University Artoi, April 2001.

Jožef Ritonja, “Adaptive control for synchronous generator stability improvement,” invited speech at the Applied Cybernetic Centre of the department of Control Engineering, Prague, Czech Republic, Nov. 24, 2001.


Prof. Dr. Drago Dolinar: Scientific Committee of VANEM 2001 Conference, Lodz, Poland.


Prof. Dr. Drago Dolinar: Modelling and Control of Electrical Machines, lecture at University d’ Artois, Bethune, France, April 2001.

Prof. Dr. Drago Dolinar: Visit to the Central Queensland University, Rockhampton, Australia (Prof. P. Wolfs), May 2001.


Asst. Prof. Dr. Gorazd Štumberger: Work in the project entitled “Sizing design of a permanent magnet linear motor for aircraft launch” (project leader: Thomas A. Lipo, University of Wisconsin-Madison; co-workers: Gorazd Štumberger, Mehmet Aydemir; sponsor: Office of Naval Research), University of Wisconsin–Madison, Aug. 8 to Nov. 30, 2001.

Prof. Dr. Bojan Grčar: Research work in the project entitled “Non-Linear Control of Induction Motors”, Northeastern University Boston, Nov. 1–30, 2001.

Prof. Dr. Drago Dolinar: KU Leuven, Belgium, research co-operation.

Asst. Prof. Dr. Jožef Ritonja: Czech Technical University of Prague, CEEPUS fellowship holder.

GUESTS AND VISITORS

Prof. Dr. Kay Hameyer (KU Leuven, Belgium):

Visiting the laboratory, work with doctoral candidate, work in the research project, Sept. 2001.

Prof. Dr. Kay Hameyer (KU Leuven, Belgium):

Lecture entitled “Some aspects to the computation of electromagnetic fields”, Oct. 2001.


Prof. Dr. Bojan Grčar, Silver Award of the University of Maribor.

Prof. Dr. Bojan Grčar, Award for Successful and Innovatory Co-operation with Industry, Faculty of Electrical Engineering and Computer Science of Maribor, Slovenia, Nov. 2001.

PE – 32 Fundamentals and Theory of Electrotechnics Laboratory

FUNDAMENTALS AND THEORY OF ELECTROTECHNICS LABORATORY

Head:

Assoc. Prof. Dr. Igor Tičar

Phone: +386 2 220 70 80


RESEARCH PROJECTS

Industrial project

New Motor Starter

Leader: Assoc. Prof. Dr. Jože Pihler Participants: Dr. J. Voršič, Dr. I. Tičar, D. Koritnik, A. Hanžič, M. Stegne A.

Lovrenčič (ELA), J. Jeraj (Orkom), J. Varga (Vitalner)

Financed by: ELA Slovenske Konjice, Vitalner d.o.o., Slovenia

In the year 2001 the method for the mechanical fixing of a starter was modified according to the requirements of European customers. The electromagnetic drive was modified according to the requirements of the American market, i.e.110 V and 230 V, 60 Hz. The imperfections detected during the prototype tests were eliminated and new testing of the first manufactured series of products has been performed in compliance with IEC 60947-41 subclause 9.3.1:

Test sequence 1: Temperature rise test - IEC 60947-4-1 subclause 9.3.3.3 Operation and operational limits test - IEC 60947-4-1 subclause 9.3.3.1 in 9.3.3.2 Dielectric test - IEC 60947-4-1 subclause 9.3.3.4

Test sequence 2: Rated Making & Breaking capacity test- IEC 60947-4-1 subclause 9.3.3.5 Conventional operation test - IEC 60947-4-1 subclause 9.3.3.6

Test sequence 3: Short circuit operation test - IEC 60947-4-1 subclause 9.3.4

Fundamentals and Theory of Electrotechnics Laboratory PE – 33

Test sequence 4: Ability of conducting overload current test - IEC 60947-4-1 subclause 9.3.5

Test sequence 5: Mechanical properties of connections test – IEC 60947-1 subclause 8.2.4

Patent applications were submitted to some foreign countries (European Union, USA, Russia, Japan, India, etc.), and the technical documentation was re-arranged accordingly.


Slo-A19/2002 Virtual Electromagnetic Laboratory and Web-based Distance Learning

Leader: Assoc. Prof. Dr. Igor Tičar Participants: Dr. J. Pihler; Dr. A. Hamler; A. Orgulan, MSc; M. Žnidarič, MSc;

Prof. Dr. Kurt Preis (IGTE) Project Partners: Institut für Grundlagen und Theorie der Elektrotechnik (IGTE), TU

Graz, Austria


This project will intensify the successful co-operation between Laboratory of Applicative Electrical Engineering of FERI and Institut für Grundlagen und Theorie der Elektrotechnik (IGTE) of TU Graz. Both institutions have successfully co-operated for many years in the field of numerically solving electromagnetic field problems, which is evident from several commonly published papers. During the last couple of years this co-operation has been especially intense and successful in the field of computer supported educational programmes for the subjects entitled Principles of Electrical Engineering and Theoretical Electrical Engineering. The solving of applicative problems for industry using previously developed program tools has also been very successful. Further upgrading of existing and design of new program tools will include the development of new pre-processors for planar and rotationally symmetrical electromagnetic problems, pre-processors for planar problems in polar co-ordinates for electrical machines, two and three dimensional program packages EleFAnT2D and EleFAnT3D. In addition to these, some examples of virtual electromagnetic laboratory will be developed to improve practical exercises for the subject Principles of Electrical Engineering. Procedures will also be developed for the computer animation of electromagnetic phenomena.

The institutes at TU Budapest and TU Stuttgart are also included in this co-operation. The Austrian partner also co-operates with the University of Bath (UK) and University of Genoa (I) in the EU project Teleteaching and distance education and in INCO COPERNICUS project P.nr. 15CT960703.


PUBLICATIONS

Igor Tičar, Jože Pihler, Oszkár Bíró, Kurt Preis, “Partial discharges in insulation of medium voltage systems,” Compel, Vol. 20, No. 2, pp. 473-481, 2001.


Andrej Orgulan, Jože Voršič, “Vpliv razsvetljave na okolje,” EGES, Energ. gospod. ekol. Slov., Vol. 5, No. 5, pp. 86-90, Sept. – Nov. 2001.

Vlado Planinšek, Andrej Orgulan, Stanko Eršte, “Regulativa s področja svetlobnega onesnaževanja okolja v Sloveniji,” Svetl. teh., Vol. 13, No. 1, pp. 14-19, Dec. 2001.

Sašo Zupan, Andrej Orgulan, “Bleščanje v zunanji razsvetljavi,” Zbornik Slovenskega društva za razsvetljavo, Maribor, Slovenia, pp. 69-82.

Igor Tičar, Martin Zorič, Osnove elektrotehnike. Vol. 3, Izmenični tokokrogi in prehodni pojavi. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Jurij Krope, V. Vasič, Igor Tičar, Darko Goričanec, “From cogeneration to trigeneration: exergoeconomic evaluation of simultaneous production,” CIEER '01, Santiago de Cuba, Cuba, 5 pp.

Viljem Kozic, Jurij Krope, Igor Tičar, “Laboratory measurements on magnetic water treatment device,” 27th Annual Conference of the IEEE Industrial Electronics Society IECON '01, Denver, USA, Nov. 2001, pp. 2190-2193.

Jože Pihler, Igor Tičar, Jože Voršič, Oszkar Biro, Kurt Preis, “Design of SF6 switchgear components by means of electric field calculations,” 5th WSES International Conference on Circuits, Systems, Communications and Computers (CSCC 2001), 3rd WSES International Conference on Mathematics and Computers in Physics (MCP 2001), 3rd WSES International Conference on Mathematics and Computers in Mechanical Engineering (MCME 2001), Rethymno, Greece July 2001, pp. 7801-7806.

Kurt Preis, Oszkar Biró, Thomas Ebner, Igor Tičar, “An electromagnetic field analyis tool in education,” COMPUMAG, Vol. 4, pp. 122-123.

Igor Tičar, Oszkar Bíró, Kurt Preis, “Vector potential expanded by edge basis functions associated with loops on finite element facets,” COMPUMAG, Vol. 3, pp. 126-127.

Fundamentals and Theory of Electrotechnics Laboratory PE – 35

Nermin Sarajlić, Tatjana Konjić, Jože Voršič, Andrej Orgulan, “Povećanje gubitka zbog viših harmonika u mreži,” V. Savjetovanje Bosanskohercegovačkog komiteta CIGRÉ, Neum, Bosnia and Herzegovina, Sept. 2001, pp. 36-32 - 36-35.

Igor Tičar, Jože Pihler, Aleš Žuželj, “Načrtovanje indikatorjev napetosti v srednjenapetostnih stikalnih napravah,” Peta konferenca slovenskih elektroenergetikov, Bled, Slovenia, May 2001, Part 1, pp. 13-1 - 13-7.

Jože Pihler, Igor Tičar, Peter Kitak, Mitja Kos, “Izbira elementov SF[spodaj]6 stikalne naprave s pomočjo izračuna električnega polja,” Peta konferenca slovenskih elektroenergetikov, Bled, Slovenia, May 2001, Part 1, pp. 13-33 - 13-39.

Andrej Orgulan, Darko Koritnik, Jože Voršič, “Novosti s področja visokonapetostnih svetlobnih cevi,” 22. posvetovanje o močnostni elektrotehniki in sodobnih električnih instalacijah, Kotnikovi dnevi, Radenci, Slovenia, Mar. 2001, pp. 103-112.

Dejvi Ružič, Igor Tičar, Kurt Preis, Oszkar Biro, “Simulation of high frequency elektromagnetic field with tem propagantion mode methode,” The first Slovenian-Polish Joint Seminar on Computational and Applied Electromagnetics, Maribor, Slovenia, Sept. 2001, pp. 26.

Vlado Planinšek, Andrej Orgulan, Stanko Eršte, “Zmanjšanje motečih emisij svetlobe. Reducing disturbing light emisions,” Svetlobno onesnaženje: javna predstavitev mnenj, Ljubljana, Slovenia, pp. 141-158.


Andrej Orgulan, MSc: Editor of Slovenian Lighting Association magazine “Svetlobna tehnika”, Maribor, Slovenia, 2001.

Andrej Orgulan, MSc: Editor of the proceedings of Slovenian Lighting Association, Maribor, Slovenia, 2001.


Andrej Orgulan, MSc: Visit to the Lighting Technology Laboratory in SITEC, Trunrent: presentation of the laboratory, lighting technology centre and manufacturing of lamps; talks about co-operation in the fields of research and education, Turnrent, March 22–23, 2001.


Assoc. Prof. Dr. Igor Tičar: TU Graz, IGTE – Virtual Electromagnetic Lab.

Assoc. Prof. Dr. Igor Tičar: TU Budapest – Theoretical Electrotechics Institute – Fluxet sensor.

GUESTS AND VISITORS

Prof. Dr. Kurt Preis, Prof. Dr. Oszkar Biro (Technical University of Graz, Austria):

Visit from the Faculty of Electrical Engineering – Virtual Electromagnetic Laboratory of Graz.

Applied Electromagnetics Laboratory PE – 37

APPLIED ELECTROMAGNETICS LABORATORY

Head:

Assoc. Prof. Dr. Mladen Trlep

Phone: +386 2 220 70 41


RESEARCH PROJECTS


Industrial projects

Optimisation of the poles of a 1 phase synchronous motor with permanent magnets

Leader: Assoc. Prof. Dr. Anton Hamler Participants: M. Trlep, M. Jesenik, B. Štumberger, V. Goričan

Financed by: Iskra MEHANIZMI, d.d., Lipnica 8, KROPA, Slovenia

The aim of this project is to assure the reliable operation of the synchronous motor with permanent magnets in the as big as possible voltage range with an in advance defined rotation direction, which is unreliably defined by that motor. Both demands can be satisfied by the shaping of the stator poles. Automatic optimisation algorithms cannot be used for the shaping of the poles, because the connection between pole shape, rotational torque and operation reliability at different voltages is covered. This is the reason why intuitive shaping procedures were used, which were based on the finite element method magnetic field analysis and on the direct method of torque calculation from magnetic field distribution. The prototype is made and it is in the testing stage. In the range of this project investigations were made and the first prototype of the rotor for synchronous motors with 24 poles made of Ne Fe B magnets was made. To achieve good quality magnetizations of these materials, a large amount of energy is required. A large amount of energy causes big problems at the more pole magnetizations of small dimension magnets.

Development of permanent magnets direct current motor

Leader: Assoc. Prof. Dr. Anton Hamler Participants: M. Trlep, M. Jesenik, B. Štumberger, V. Goričan

PE – 38 Applied Electromagnetics Laboratory

Financed by: BSH Hišni aparati, d.o.o, Savinjska cesta 30, Nazarje, Slovenia

The aim of this project is the development of a direct-current motor with permanent magnets, with parameters such as power, rotational torque, operation duration, heating, blocking moment, free run rotations, quantity and the kinds of used material suited to strict tolerance demands. Dimensions of this motor are highly limited, because of the reasons for using this motor. All these facts required research into the permanent magnets demagnetization process in the case of the short contact, and in the case of the rotor, coil heating. Extra attention is focused on the motor supply, which is made using a rectifier. In this way the performance of the motor is changed and motor the characteristics are influenced. This motor is momentarily at the stage of prototype testing.

Wide applicable linear motor

Leader: Assoc. Prof. Dr. Anton Hamler Participants: M. Trlep, M. Jesenik, B. Štumberger, V. Goričan,

Financed by: Applied Electromagnetics Laboratory, Ideal sistemi, Grajska vas, Gomilsko, Slovenia

The aim of the cooperation for this project is the production of widely applicable and robust reluctance motors. The shapes of the active motor parts were constructed and an analysis was made of the magnetic and mechanical conditions. More variants of the secondary part of the motor were expected dependant on driving requirements. Prototype is in the stage of testing. The potential areas of usage will be various transport and production systems.

Production of prototype and preparing pilot production of the switch MS 32

Leader: Assoc. Prof. Dr. Anton Hamler Participants: M. Trlep, M. Bizjak, M. Jesenik, B. Štumberger, V. Goričan, G.

Hrovat

Financed by: Ministry of Economy, Iskra Stikala d.d. Savska loka 4, Kranj, Slovenia

Project was related to the development of a technical pretentious motor protection switch, the production of which will be cheaper than the production of existing less pretentious switches. Analysis of the magnetic, electrical and heating conditions, already done from the basic idea of switch construction, was our job in that project. Because the construction of the type of switch defines is 70% of costs, it bears the main burden of the switch price. The construction has likewise a basic influence on switch efficiency, which can be changed during the development and switch construction only, as earlier mentioned analysis. Pilot switch production is in the stage of testing.



Numerical modelling of electromagnetic structures

Leader: Assoc. Prof. Dr. Mladen Trlep, Prof. Dr. Andrzej Krawczyk Participants: B. Hribernik, A. Hamler, M. Jesenik, G. Štumberger, V. Goričan,

J. Sikora, J. Starzynski, R. Sikora, S. Wiak

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia and Ministry of Economy, Polish academy of Sciences

Applications of numerical methods for electromagnetic field analysis in biological tissues together with the development of an inverse approach with the DRM method for use in medical diagnostics was the work covered by this project. New software, which will provide some specific solutions and will be adapted to the existing program solutions, is being developed. The first Slovenian – Polish seminar on the subject of application electromagnetism was conducted during this project.



J2-7611-0796-99 Elektromagnetne naprave - temeljne računske metode (Electromagnetic Devices – Basic Computational Methods)

Leader: Prof. Dr. Božidar Hribernik Participants: M. Trlep, A. Hamler, D. Dolinar, M. Jesenik, B. Štumberger, G.

Štumberger, B. Slemnik

Financed by: Ministry of Science and Technology of the Republic of Slovenia Duration: 1996 – 2001

The main aim of this project was the development of computer methods for calculating how electromagnetic fields activity effects static and dynamic conditions by taking real properties of the used material into account. The pretentiousness of the provided project was the reason, that if was divided into three thematic parts (1. Basic numerical method – leader M. Trlep, 2. Consideration of the real material characteristics – leader A. Hamler, 3. dynamic models – leader D. Dolinar). The basis of everything was development of the basic numerical methods. The emphasis was on the finite element method – FEM, which was completed using the boundary element method and both methods were the basis for the development of a hybrid method. Calculation can be made by the consideration of the linear or non-linear conditions and in the two dimensional or three dimensional spaces. Time problems were expanded from the first harmonic problems into the transient problems. During the last period


inverse problems were calculated too. More mathematical models of the hysteresis (Jiles-Lagevin, Stoner-Wohlfart, Preisach and others) were studied by investigations of the real materials characteristics. In the range of the project the Preisach hysteresis model was chosen. The scalar model was expanded into the vector model. By realisation of the project, necessary measuring methods were developed and appropriate measuring and computer equipment was obtained or chosen. Appropriate sensors were investigated and developed and computer simulations of the measurements with help of numerical methods were developed. Although the developed methods make possible the calculations of many problems, the development of these methods is unfinished, because new bigger and bigger challenges demand continuous progress.

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Measurement of magnetic properties of electrical steel sheets in pure rotational or alternating magnetic

field using round rotational single sheet tester.

Applied projects

L2-7718-0796-99 Strukture električnih pogonov (Structure of Electric Drives)

Leader: Prof. Dr. Božidar Hribernik Participants: Karel Jezernik, Anton Hamler, Ivan Zagradišnik, Alenka Hren, Miran

Rodič, Dušan Drevenšek, Milan Curkovič, Jože Korelič, Mladen Trlep, Bojan Štumberger, Marko Jesenik, Bogdan Kreča, Matjaž Plejić, Viktor Goričan, Bojan Slemnik, Matej Gajzer


Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia and the INDRAMAT Železniki Company, Slovenia

Duration: 1999 – 2001

Finding the optimal realization of electric drives with regard to possible structures was the main idea of the project. Research of the control was focused on the carrying out of a control scheme for alternating current motors without the use of mechanical sensors, that increases the priority of such a drive in regard to price, smaller external dimensions and easier support. Parallel research was done in two areas. The first area was direct control of the moment and the second area was usage of the direct vector scheme for motor control. The actions of both control schemes were checked and confirmed with simulations and experiments under real conditions. Analysis of the properties of different magnetic structures of electric engine can be made for some types and application by determination of inductivity and torques or engine forces. Iron losses have to be known for more accurate calculations. CAD packages for calculating the position dependant inductivities and torques or forces based on the finite element method were developed. Procedure for calculation of losses in the iron cores of the alternating and rotational (elliptic) sinusoidal and non-sinusoidal fields were developed. The accuracy of the five mathematical-physics models for the losses calculations was investigated. Results were verified and validity was confirmed on a synchronous engine with sunken permanent magnets and on the reluctance linear synchronous motor. Results of the work on the project were published at conferences, in the technical and scientific magazines and were directly transferred into the economy. Our main partners are DOMEL, or INDRAMAT Železniki, BSH Nazarje, ROTOMATIKA Sp. Idrija and ISKRA MEHANIZMI Kranj.

PUBLICATIONS

Bojan Štumberger, Anton Hamler, Mladen Trlep, Marko Jesenik, “Analysis of interior permanent magnet synchronous motor designed for flux weakening operation,” IEEE trans. magn., Vol. 37, No. 5, pp. 3644-3647, Sept. 2001.

Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, Anton Hamler, “Cross magnetization effect on inductances of linear synchronous reluctance motor under load conditions,” IEEE trans. magn., Vol. 37, No. 5, pp. 3658-3662, Sept. 2001.

Mladen Trlep, Anton Hamler, Marko Jesenik, Bojan Štumberger, “The use of dual reciprocity method for electrical impedance tomography,” IEEE trans. magn., Vol. 37, No. 5, pp. 3221-3224, Sept. 2001.

Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, “Eksperimentalna metoda določanja induktivnosti linearnega sinhronskega reluktančnega motorja z uporabo vodenega napetostnega pretvornika,” Electrotechnical Review, Vol. 68, No. 1, pp. 32-38, 2001.


Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, “Nelinearni model linearnega sinhronskega reluktančnega motorja: analiza stroja,” Electrotechnical Review, Vol. 68, No 5, pp. 247-252, 2001.

Viljem Kozinc, “Razvoj električne vleke od začetkov do danes (1. del),” ER, Vol. 2, No. 1, pp. 33-34, 2001.

Viljem Kozinc, “Tehnološki razvoj električne vleke (2. del),” ER, Vol. 2, No. 2, pp. 39-42, 2001.

Viljem Kozinc, “Tehnološki razvoj električne vleke (3. del),” ER, Vol. 2, No. 3, pp. 51-53, 2001.

Viljem Kozinc, “Tehnološki razvoj električne vleke (4. del): tranzistorska tehnika z IGBT (insulated gate bipolar transistor) tranzistorji in asinhronskimi vlečnimi motorji,” ER, Vol. 2, No. 4, pp. 28-30, 2001.

Božidar Hribernik, Vojko Musil, Anton Hamler, Elektrotehnični materiali, Modul: Izolanti in dielektriki: učbenik. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.


Anton Hamler, Mladen Trlep, Bojan Štumberger, Marko Jesenik, “Finite element analysis of linear reluctance motorr,” 5th WSES International Conference on Circuits, Systems, Communications and Computers (CSCC 2001), 3rd WSES International Conference on Mathematics and Computers in Physics (MCP 2001), 3rd WSES International Conference on Mathematics and Computers in Mechanical Engineering (MCME 2001), Rethymno, Greece, July 2001, pp. 90-93.

Jernej Ribič, Bojan Štumberger, Anton Hamler, Božidar Hribernik, “Integral approach to calculation of induction machine,” 4th international symposium on advanced electromechanical motion systems Electromotion '01, Bologna, Italy, June 2001, pp. 15-18.

Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, “Position and current dependent flux linkages, thrust and friction force of linear synchronous reluctance motor,” The IEEE industry applications conference, pp. 2310-2317.

Bojan Štumberger, Gorazd Štumberger, Drago Dolinar, Anton Hamler, Mladen Trlep, “Evaluation of saturation and cross-magnetization effects in interior permanent magnet synchronous motor,” The IEEE industry applications conference, pp. 2563-2562.


Bojan Štumberger, Gorazd Štumberger, Anton Hamler, Drago Dolinar, Mladen Trlep, “Analysis of saturation and cross magnetization effects in flux-weakened interior permanent magnet synchronous motor,” COMPUMAG, Vol. 4, pp. 52-53.

Mladen Trlep, Anton Hamler, Marko Jesenik, Bojan Štumberger, “The search of the unknown conductivity distribution by dual reciprocity method,” COMPUMAG, Vol. 4, pp. 144-145.

Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, Anton Hamler, “Calculation of two-axis nonlinear dynamic linear synchronous reluctance motor model parameters by finite element method,” COMPUMAG, Vol. 2, pp. 154-155.

Viktor Goričan, Anton Hamler, Marko Jesenik, Bojan Štumberger, Mladen Trlep, “Unreliable determination of vector B in 2-D SST,” Soft Magnetic Materials Conference, Bilbao, Spain, Sept. 2001, pp. A-50.

Marko Jesenik, Viktor Goričan, Mladen Trlep, Anton Hamler, Bojan Štumberger, “Field homogenity in a two-phase round rotational single sheet tester with one and both side shields,” Soft Magnetic Materials Conference, Bilbao, Spain, Sept. 2001, pp. C-05.

Bojan Štumberger, Viktor Goričan, Gorazd Štumberger, Anton Hamler, Mladen Trlep, Marko Jesenik, “Accurateness of posterior iron loss calculation in electrical machines by using different iron loss models,” Soft Magnetic Materials Conference, Bilbao, Spain, Sept. 2001, pp. C-14.

Gorazd Štumberger, Bojan Štumberger, Drago Dolinar, “Magnetically nonlinear and anisotropic iron core model of synchronous reluctance motor,” Soft Magnetic Materials Conference, Bilbao, Spain, Sept. 2001, pp. G-05.

Marko Jesenik, Viktor Goričan, Mladen Trlep, Anton Hamler, Bojan Štumberger, “Field homogeneity in a two-phase round rotational single sheet tester with and without the shields,” International symposium on electromagnetic fields in electrical engineering, Krakow, Poland, Sept. 2001, pp. 587-592.

Anton Hamler, Martin Bizjak, Marko Jesenik, Bojan Štumberger, Mladen Trlep, “Analysis of conditions in circuit breaker,” International symposium on electromagnetic fields in electrical engineering, Krakow, Poland, Sept. 2001, pp. 159-164.

Bojan Štumberger, Viktor Goričan, Anton Hamler, Mladen Trlep, Marko Jesenik, “Comparison of different models for iron core loss calculation in electrical machines,” International symposium on electromagnetic fields in electrical engineering, Krakow, Poland, Sept. 2001, pp. 205-210.


Jernej Ribič, Bojan Štumberger, Anton Hamler, “Izračun induktivnosti statorja asinhronskega motorja z metodo končnih elementov,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 409-412.

Jernej Ribič, Bojan Štumberger, Anton Hamler, “Finite element analysis of cage in cage induction motor,” The first Slovenian-Polish Joint Seminar on Computational and Applied Electromagnetics, Maribor, Slovenia, Sept. 2001, pp. 17.

Janez Rozman, Mladen Trlep, Bojan Zorko, Matjaž Bunc, “Stimulation of nerves innervating the pancreas of a dog,” The first Slovenian-Polish Joint Seminar on Computational and Applied Electromagnetics, Maribor, Slovenia, Sept. 2001, pp. 24.

Bojan Štumberger, Anton Hamler, Marko Jesenik, Viktor Goričan, Mladen Trlep, “Flux-Weakening and output power capability estimation of interior permanent magnet synchronous motor in variable speed drive applications,” The first Slovenian-Polish Joint Seminar on Computational and Applied Electromagnetics, Maribor, Slovenia, Sept. 2001, pp. 34.

Marko Jesenik, Viktor Goričan, Mladen Trlep, Anton Hamler, Bojan Štumberger, “Eddy current calculation in the circular sample of the two-phase rotational single sheet tester,” The first Slovenian-Polish Joint Seminar on Computational and Applied Electromagnetics, Maribor, Slovenia, Sept. 2001, pp. 35.

Viktor Goričan, Anton Hamler, Marko Jesenik, Bojan Štumberger, Mladen Trlep, “Measurement set-up for 1-D and 2-D testing of magnetic properties of magnetic steel sheets,” The first Slovenian-Polish Joint Seminar on Computational and Applied Electromagnetics, Maribor, Slovenia, Sept. 2001, pp. 36.

Anton Hamler, Bojan Štumberger, Marko Jesenik, Mladen Trlep, “Analysis of linear reluctance motor,” The first Slovenian-Polish Joint Seminar on Computational and Applied Electromagnetics, Maribor, Slovenia, Sept. 2001, pp. 39.


Assoc. Prof. Dr. Mladen Trlep: The aim of Slovenian-Polish conference was a review of the Slovene and Polish scientific work in the field of numerical calculations of electromagnetic fields and a review of the applications from this field; next conference will be in 2003 in Poland; Faculty of Electrical Engineering and Computer Science of Maribor, Slovenia, Sept. 10–12, 2001.


Assoc. Prof. Dr. Mladen Trlep, Assoc. Prof. Dr. Anton Hamler, Dr. B. Štumberger, Dr. M. Jesenik:

Reviewers for JOURNAL OF TECHNICAL PHYSICS, Warsow, Poland.


Assoc. Prof. Dr. Mladen Trlep: Institute of Electrical Engineering, Warsaw, Poland.

Assoc. Prof. Dr. Mladen Trlep: Technical University of Czestochowa, Czestochowa, Poland.

Dr. B. Štumberger, V. Goričan, J. Ribič:

Instituto Elettrotecnico Nazionale, Torino, Italy.

GUESTS AND VISITORS

Prof. Dr. Andrzej Krawczyk (Institute of Electrical Engineering, Warsaw, Poland), Prof. dr. Slawomir Wiak (Technical University of Lodz, Institute of Electrotechnical machines and Transformers, Lodz, Poland):

Co-operation within the joint Slovene-Polish project.

Y. Ishihara (Doshisha University, Kyoto, Japan):


Prof. Dr. Zijad Haznadar, Prof. Dr. Željko Štih, Prof. Dr. Sead Berberovič (Faculty of Electrical Engineering and Computing, Zagreb, Croatia):


Marija Čundeva (University “Sts Cyril & Methodius”, Faculty of Electrical Engineering, Skopje, Macedonia):



Olaf Henze (University of Stuttgart, Institute for Theory of Electrical, Engineering, Stuttgart, Germany):


Institute of Robotics RO – 1

INSTITUTE OF ROBOTICS

Head:


Phone: +386 2 220 73 00


URL: http://www.ro.feri.uni-mb.si

The Institute of Robotics performs basic and applied research for the development and building of robotics systems, production automatization, sensor systems, control theory, modeling, identifications, computer process control, industrial robotics, servo-systems, robot controllers, and real-time control systems. We develop advanced-control algorithms for the control of position, speed, and torque with the use of various kinds of executive modules and constructions of robotic mechanisms.

In the Kinematics and Simulation Laboratory, we conduct robot and robotization kinematics control and process simulation. We use both real and simulated controllers and mechanisms. Simulations deal with virtual and real systems and processes. We also investigate nonlinear and robust control for this reason.

In the Power Electronics Laboratory, we study electronic power devices. We research resonance converters and basic structures of DC/DC converters through modulation procedures.

The Institute of Robotics co-operates with many universities abroad. In the Socrates-Erasmus project we co-operate with Universidade do Minho - Portugal, Technische Universität Braunschweig - Germany, Technische Universität Wien - Austria, Universitat Politechnica de

RO – 2 Institute of Robotics

Catalunya - Spain, Universitat Rovira i Virgili - Spain, Loughborough University - United Kingdom. In CEEPUS program we co-operate with Technical University of Timisoara - Romania, Budapest University of Technology and Economics - Hungary, Cracow University of Technology - Poland, Vienna University of Technology - Austria in Technical University of Košice - Slovak republic.

The institute members are listed below by the laboratory with which they are affiliated.

Power Electronics Laboratory

Head: Assoc. Prof. Dr. Miro Milanović

Industrial Robotics

Laboratory Head:


Kinematics and Simulations Laboratory

Head: Assoc. Prof. Dr. Peter Cafuta

Institute of Robotics Head:


Institute of Robotics RO – 3

Power Electronics Laboratory

Head: Assoc. Prof. Dr. Miro Milanović

Employees: Dr. Franc Mihalič, Dr. Alenka Hren, Anton Otič

Industrial Robotics Laboratory


Employees: Assoc. Prof. Dr. Riko Šafarič; Asst. Prof. Dr. Martin Terbuc; Dr. Miran Rodič; Dr. Suzana Uran; Dr. Dušan Drevenšek; Dr. Aleš Hace; Dr. Andreja Rojko; Janez Pogorelc, MSc; Milan Čurkovič, BSc; Gregor Edelbaher, BSc; Jože Harnik, BSc; Jože Korelič, BSc; Evgen Urlep, BSc

Technological Centre for Mechatronics and Automation (TCMA)


Kinematics and Simulation Laboratory

Head: Assoc. Prof. Dr. Peter Cafuta

Employees: Asst. Prof. Dr. Boris Curk, Marijan Španer

RO – 4 Power Electronics Laboratory

POWER ELECTRONICS LABORATORY

Head:

Assoc. Prof. Dr. Miro Milanović

Phone: +386 2 220 73 30


RESEARCH PROJECTS


Applied project

L2-1346-796 High-frequency Unipolar Resonant Link Converter

Leader: Assoc. Prof. Dr. Miro Milanović Participants: Prof. Dr. K. Jezernik, F. Mihalič, A. Hren, R. Kovačič, A. Otič


Direct AC to AC matrix converters are devices interposed between sources of electrical energy and loads that usually convert energy from an AC voltage source to some other AC voltage with variable magnitude and frequency. In principle, for a given set of input three phase voltages, any desired set of output voltages can be synthesised by suitably toggling matrix switches. The well known theory states that an AC to AC matrix converter can operate with a unity power factor. Symmetric and antisymmetric switching strategies enable this mode of operation. The hard switching mode operation has been traditionally used in ordinary matrix converters. In the proposed research project we would like to introduce a soft switching mode of operation. The resonant link capacitor will be distributed at the matrix switching transistor. In addition the unity displacement factor operation will be achieved by using combined symmetric and antisymmetric modulation strategy. This combined algorithm enables a unity displacement factor operation without current sensing and current control.

Power Electronics Laboratory RO – 5

PUBLICATIONS

Franc Mihalič, Miro Milanovič, “Zmanjšanje prevodnih motenj z naključno PŠM,” Inf. MIDEM, Vol. 31, No. 3, pp. 169-177, 2001.

Marjan Bezjak, Miro Milanovič, Rudolf Babič, “Stikalni močnostni tonski ojačevalnik,” Svet elektron., Vol. 8, No. 72, pp. 50-55, 2001.

Miro Milanovič, “Razbremenilno-zaščitna vezja tranzistorjev v DC-DC pretvornikih,” Svet elektron., Vol. 8, No. 74, pp. 29-36, 2001.

Janez Trontelj, Zmago Brezočnik, Miro Milanovič, Rudolf Babič, Anton Pleteršek, Mitja Solar, Alenka Hren, Franc Mihalič, Filip Samo Balan, Bojan Jarc, Mitja Solar (ed.), Krožni praktikum: smer elektronika: univerzitetni program, 4. in 5. letnik (7.,8. in 9. semester): navodila za vaje. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Rudi Prosen, Miro Milanovič, Drago Dolinar, “Unity IDF correction for AC to DC converter based on modulation strategy,” ISCAS 2001, pp. III-389 - III-392.

Miro Milanović, Rudi Prosen, Franc Mihalič, “Switching matrix approach based modulation for AC to DC converter,” 9th Mediterranean conference on control and automation, Dubrovnik, Croatia, June 2001.

Franc Mihalič, “Frekvenčna analiza stikalnega usmernika,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 89-92.

Miro Milanovič, Peter Kuzman, “Uporaba Parkove transformacije pri pretvorbi enofazne napetosti v trifazno,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 467-470.

Miro Milanovič, “Modulation principle for IDF correction in AC to DC converters,” International summer school of automation, Maribor, Slovenia, June 2001, pp. 123-128.

Marjan Bezjak, Miro Milanović, Rudolf Babič, “Stikalni močnostni tonski ojačevalniki,” Akustika: konstrukcije in samogradnje akustičnih naprav, Ljubljana, Slovenia, pp. 78-86.


Assoc. Prof. Dr. Miro Milanović: Member of the technical program committee, IEEE International Symposium on Circuits and Systems, Sydney, Australia, May 2001.

RO – 6 Power Electronics Laboratory

Assoc. Prof. Dr. Miro Milanović: Member of the organising committee, Annual Electrical and Computer Science Conference, Portorož, Slovenia, Sept. 2001.

Assoc. Prof. Dr. Miro Milanović: Organizer of special session “Non-linear Control and PWM”, 9th Mediterranean Conference on Control and Automation.

Industrial Robotics Laboratory RO – 7

INDUSTRIAL ROBOTICS LABORATORY

Head:


Phone: +386 2 220 73 00


RESEARCH PROJECTS


Industrial project

R55-3355 Stroj za razrez z vodnim curkom (Waterjet cutting machine)

Leader: Asst. Prof. Dr. Martin Terbuc Participants: Dr. Miran Rodič, Dr. Aleš Hace, Marijan Španer

Financed by: Ministry of Education, Science and Sport, Alpina d.d., Žiri, Slovenia

The goal of this project is a waterjet cutting machine. This machine will introduce a higher level of flexibility in the shoe production process. It will even allow the production of a single particular pair of shoes. The waterjet machine will be included in the shoe production process in the first working phase, which follows after defining the shoes geometry using the CAD system.


UNISTRUCT Novel methods of adaptive control based on simplified uniform structures and learning

Leader: Prof. Dr. Karel Jezernik, Prof. Dr. Jozsef K. Tar Participants: Dr. Martin Terbuc, Dr. Riko Šafarič, Dr. Aleš Hace, Dr. Andreja

Rojko, Prof. Dr. Imre Rudas, Dr. Janos F. Bito, Dr. Laslo Horvat


Slovenian-Hungarian intergovernmental S&T cooperation programme. It is hoped that a novel

RO – 8 Industrial Robotics Laboratory

special branch of soft computing can be developed. Also, clarifying the necesssary conditions for convergence is expected. The results will be illustrated via simulation results. It is expected that the new approach will be efficient in various practical fields of control applications.



J2-7527-796 Napredne strukture mehanskega gibanja (Advanced motion control)

Leader: Prof. Dr. Karel Jezernik

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia Duration: 1996 – 2001

The dynamic input-output behavior of mechanical motion is characterised by structural uncertainties. The key parameters of control plant change during operation depending on load and friction. The aim of this project is to derive robust sliding mode and adaptive neural and fuzzy control algorithms and implement them in special micro-controllers and/or transputer multiprocessor networks. We derived, and experimentaly tested, robust control algorithms with variable structures for AC servo motors with asynchronous and synchronous permanent magnet motors. We verified theoretically derived control results through experimentation with nonlinear loads on multi-axis manipulators for direct drive servo motors. We also studied position/force control algorithms for manipulators in joint and space coordinates.

Applied projects

2811-01-00052 Novi didaktični pristopi študija na daljavo (A new educational approach for a distance learning)

Leader: Assoc. Prof. Dr. Riko Šafarič Participants: Dr. Boris Curk, Aleš Polič

Financed by: Ministry of Information Society of the Republic of Slovenia Duration: 3 month

The server system for a faculty computer network was built. The old long distance server educational software was transfered to the newig built server system. A software driver for a video system and a distance control camera was made. An actuation software driver for 1


DOF robot mechanism to be controlled via the internet was made.

L2-1506-796 Strukture električnih pogonov (Structure of Electric Drives)

Leader: Prof. Dr. Božidar Hribernik Participants: A combined project; participants from the Institute of robotics: Prof.

Dr. Karel Jezernik, Dr. Alenka Hren, Milan Čurkovič, Jože Korelič

Financed by: Ministry of Education, Science and Sport, Domel d.d., Železnik, Slovenia

Duration: 1998 – 2001

During last year, our research was focused in the field of measurement and identification methods of induction motor (IM) parameters. Any mismatch between the actual motor parameters and those parameters used in a vector control scheme leads to deterioration of motor performance in terms of steady-state error and transient oscillations of rotor flux and motor torque. Based on the theory of electromagnetic fields, we derived a dynamic model of the linear induction motor (LIM) and we developed an input-output linearising control scheme. We verified all theoretical issues with the experimental set up of Škoda pick-up and Škoda ß elcar electric vehicles.

PUBLICATIONS

Boris Curk, Karel Jezernik, “Sliding mode control with perturbation estimation: application on DD robot mechanism,” Robotica, Vol. 19, No. 6, pp. 641-648, 2001.

Aleš Hace, Karel Jezernik, Martin Terbuc, “VSS motion control for a laser-cutting machine,” Control Engineering Practice, Vol. 9, No. 1, pp. 67-77, 2001.

Miran Rodič, Asif Šabanović, Karel Jezernik, “Sliding mode observer scheme for induction motor control,” EPE journal, Vol. 11, No. 3, pp. 29-34, 2001.

Riko Šafarič, D. W. Calkin, R. M. Parkin, C. A. Czarnecki, “Virtual environment for telerobotics,” Integr. comput.-aided eng., Vol. 8, No. 2, pp. 95-104, Apr. 2001.

Riko Šafarič, Matjaž Debevc, Rob M. Parkin, Suzana Uran, “Telerobotics experiments via Internet,” IEEE trans. ind. electron., Vol. 48, No. 2, pp. 424-431, Apr. 2001.

Jani Bajec, Janez Pogorelc, “Inteligenten robotizirani izvrševalec - F.I.R.E.: (Fully Inteligent Robotized Executer),” Svet elektron., Vol. 8, No. 78, pp. 55-57, 2001.


Janez Pogorelc, “Mikrmilnik - osnovni gradnik vgrajenih sistemov,” Svet elektron., Vol. 8, No. 79, pp. 33-38, 2001.


Miran Rodič, Karel Jezernik, “Speed sensorless continuous sliding mode torque and flux control of induction motor,” 4th international symposium on advanced electromechanical motion systems Electromotion '01, Bologna, Italy, June 2001, pp. 613-618.

Karel Jezernik, “Speed sensorless torque control of induction motor for EV's,” World Electric Vehicle association WEVA, 18th International electric vehicle symposium EVS-18, Berlin, Germany, Oct. 2001, pp. 258.

Martin Terbuc, Karel Jezernik, “Internet and mechatronics education,” 1st International conference on information tehnology in mechatronics, Istanbul, Turkey, Oct. 2001, pp. 225-228.

Andreja Rojko, Karel Jezernik, “Quasi-sliding mode control with fuzzy perturbance estimation for the nonlinear motion control systems,” 1st International conference on information tehnology in mechatronics, Istanbul, Turkey, Oct. 2001, pp. 291-296.

József K. Tar, Janós F. Bitó, Imre J. Rudas, Karel Jezernik, “Formal application of dummy parameters in a soft computing-based control of mechanical devices,” 27th Annual Conference of the IEEE Industrial Electronics Society IECON '01, Denver, USA, pp. 220-225.

Andreja Rojko, Karel Jezernik, “Sliding mode control of direct drive robot using fuzzy disturbance estimation,” 27th Annual Conference of the IEEE Industrial Electronics Society IECON '01, Denver, USA, Nov. 2001, pp. 335-340.

Andreja Rojko, Karel Jezernik, “Sliding mode-fuzzy logic control of direct drive robot,” 10th International Workshop on Robotics in Alpe-Adria-Danube Region RAAD 2001, Vienna, Austria, May 2001, 6 pp.

Riko Šafarič, Karel Jezernik, “Centralized and decentralized neural-network sliding-mode robot controller,” Advanced fuzzy-neural control: preprints, Valencia, Spain, pp. 179-184.

Gregor Edelbaher, Miran Rodič, Karel Jezernik, “Influence of output voltage deviations of PWM voltage source inverter on the speed sensorless sliding mode torque and flux control,” 9th Mediterranean conference on control and automation, Dubrovnik, Croatia, June 2001.


Andreja Rojko, Karel Jezernik, “Adaptive fuzzy disturbance estimation in sliding mode robot control,” 9th Mediterranean conference on control and automation, Dubrovnik, Croatia, June 2001.

Gregor Edelbaher, Miran Rodič, “Vpliv odklona izhodne napetosti napetosto napajanega pretvornika na obnašanje pogona brez mehanskega senzorja hitrosti,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 437-440.

Evgen Urlep, Aljaž Kapun, Aleš Hace, “Problem regulacije krogle na palici,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 235-236.

Janez Pogorelc, “Tekmovanje z mini mobilnimi roboti - motivacija za delo,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 397-400.

Aleš Polič, “Robotizacija paletizacije v industriji polnjenja pijač,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 427-428.

Karl Gotlih, Karel Jezernik, “Izračun Jacobijeve matrike z uporabo Kroneckerjevih produktov,” Kuhljevi dnevi '01, Portorož, Slovenia, Sept. 2001, pp. 105-112.

Riko Šafarič, Rob M. Parkin, “Education virtual robot arm for telerobotics,” 2nd International DETECH Workshop: Using technology in open and distance learning, Maribor, Slovenia, Sept. 2001, pp. 39-48.

Gregor Edelbaher, “Parametriranje pretvornika za asinhronski motor,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 326-331.

Miran Rodič, Karel Jezernik, “Vodenje asinhronskega motorja brez uporabe senzorja hitrosti,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 34-39.

Karel Jezernik, “Engineering education in the 21st century: interdisciplinary studies and new media,” 2nd International DETECH Workshop: Using technology in open and distance learning, Maribor, Slovenia, Sept. 2001, pp. 19.

Karel Jezernik, “Tehnologija in ekonomski razvoj,” Management visokih tehnologij, Maribor, Slovenia, Ekonomsko-poslovna fakulteta, pp. 7-13.



Prof. Dr. Karel Jezernik: IEEE, Industrial Electronics Society, Administration Committee Members, AdCom, from Dec. 1999 to Dec. 2002.

Prof. Dr. Karel Jezernik: Member of the IFAC Technical Committee on Robotics – MIR.

Prof. Dr. Karel Jezernik: President of Automatic Control Society of Slovenia.

Prof. Dr. Karel Jezernik: Technical Program Co-Chairman, reviewer and chairman of the IEEE Industrial Electronics Society Annual Conference IECON '01, Denver, USA.

Prof. Dr. Karel Jezernik: Member of the International Steering Committee and reviewer of the IEEE symposium SDEMPED '01, Gorizia, Italy.

Prof. Dr. Karel Jezernik: Member of the International Scientific Committee and chairman of the workshop RAAD 2001, Vienna, Austria.

Prof. Dr. Karel Jezernik: Member of the Program Committee of the symposium Mechatronika 2001, Trencianske teplice, Slovakia.

Prof. Dr. Karel Jezernik: Member of the International Program Committee and reviewer of the IFAC DECOM - TT 2001, Ohrid, Republic of Macedonia.

Prof. Dr. Karel Jezernik: Member of the International Program Committee of the ITM 2001, Istanbul, Turkey.

Prof. Dr. Karel Jezernik: Member of the Advisory Board of the ERK 2001, Portorož, Slovenia.

Prof. Dr. Karel Jezernik: Member of the International Program committee and reviewer of the IFAC workshop IAD 2001, Gramado, Brazil.

Prof. Dr. Karel Jezernik: Reviewer for the journal IEEE Transactions on Industrial Electronics.


Prof. Dr. Karel Jezernik: Reviewer for the journal IEEE/ASME Transactions on Mechatronics.

Prof. Dr. Karel Jezernik: Reviewer for the journal IEEE Transactions on Control Systems Technology.

Prof. Dr. Karel Jezernik: Reviewer for the conference EPE-PEMC 2002, Dubrovnik, Croatia.

Prof. Dr. Karel Jezernik: Reviewer for the IFAC World Congress 2002, Barcelona, Spain.

Prof. Dr. Karel Jezernik: Reviewer for the conference MED '01, Dubrovnik, Croatia.

Prof. Dr. Karel Jezernik: Reviewer for the IEEE symposium ISIE 2002, L'aquilla, Italy.

Assoc. Prof. Dr. Riko Šafarič: Member of the International Program Committee of the IFAC workshop AFNC'01, Valencia, Spain.


Prof. Dr. Karel Jezernik, Dr. Andreja Rojko:

Exchange of researchers: bilateral intergovernmental S&T cooperation, Budapest Polytechnic, Hungary, May 23–25, 2001.

Asst. Prof. Martin Terbuc: Exchange of researches: bilateral interuniversity S&T cooperation, University of Technology and Economics, Budapest, Hungary, May 23–25, 2001.

Prof. Dr. Karel Jezernik: Invited lecture entitled “Speed sensorless torque control of induction motor electrical vehicle”, Istanbul Technical University, Turkey, Oct. 3, 2001.

GUESTS AND VISITORS

Prof. Dr. Imre Rudas, Prof. Dr. Jozsef K. Tar (Budapest Polytechnic, Hungary):

Exchange of researchers: bilateral intergovernmental S&T cooperation, April 30 to May 12, 2001.


Tomasc Goik, Adam Slota (Cracow University of Technology, Poland):

Exchange of students in CEEPUS RO-104, July 2–20, 2001.

Prof. Dr. Ferenc Alpek (University of Technology and Economics Budapest, Hungary):

Exchange of researches: bilateral interuniversity S&T cooperation, July 3–7, 2001.

Dr. K. David Young (Hong Kong University of Science & Technology, Hong Kong):

Working visit, Aug. 14–17, 2001.

Prof. Dr. Dusan Borojevic (Virginia Tech, USA):

Working visit; lectures enititled “Education and research in power electronics at Virginia Tech” and “Design optimization of power electronics circuits using genetic algorithms - a boost PFC converter example”, Aug. 29–31, 2001.

Prof. Dr. Bo Hyung Cho (Seoul National University, Korea):

Working visit; lecture entitled “Education at School of Electrical Engineering and Computer Science, Seoul National University”, Aug. 29–31, 2001.

Prof. Dr. Thomas A. Lipo (University of Winsconsin, USA):

Working visit, Sept. 20–21, 2001.

Tomasz Kraszewski (Silesian University of technology, Poland):

Exchange of students in CEEPUS PL-0119, Oct. 2–30, 2001.

Marek Sukob, Peter Čornej (University of Technology Kosice, Slovakia):

Exchange of students in CEEPUS SK-0119, Nov. 5–30, 2001.

Kinematics and Simulation Laboratory RO – 15

KINEMATICS AND SIMULATION LABORATORY

Head:

Assoc. Prof. Dr. Peter Cafuta

Phone: +386 2 220 73 40


RESEARCH PROJECTS



J2-0823-0796-98/25 Nonlinear Control Methods for Electromechanical Systems

Leader: Assoc. Prof. Dr. Peter Cafuta Participants: Assoc. Prof. Dr. Bojan Grčar, Prof. Dr. Drago Dolinar, Asst. Prof. Dr.

Gorazd Štumberger, Asst. Prof. Dr. Boris Curk, Marjan Španer


This project includes research into interactive systems, analytical design of nonlinear control, and the experimental testing and evaluation of the results obtained. Geometric, and kinematic conditions, and dynamic characteristics (contacts) are included in the interactive system models. Holonomic conditions in particular were investigated, yet the research hypothesis is also extended to the non-holonomic examples.

PUBLICATIONS

Bojan Grčar, Peter Cafuta, Ludvik Kumin, “Exact tracking by dynamic field-weakened PMAC servodrive,” IEEE trans. energy convers., Vol. 6, No. 1, pp. 38-42, 2001.

Boris Curk, Karel Jezernik, “Sliding mode control with perturbation estimation: application on DD robot mechanism,” Robotica, Vol. 19, No. 6, pp. 641-648, 2001.

RO – 16 Kinematics and Simulation Laboratory


Marijan Španer, “Uporaba Peltierovega elementa pri laboratorijski termostatirani napravi,” Svet elektron., Vol. 8, No. 72, pp. 31-36, 2001.

Bojan Grčar, Peter Cafuta, Gorazd Štumberger, Aleksandar M. Stanković, “Pulsating torque reduction for permanent magnet AC motors,” The IEEE Joint International Conference on Control Applications & International Symposium on Intelligent Control CCA/ISIC '01, México City, Mexico, pp. 288-293.

Peter Cafuta, Žarko Čučej, Bojan Grčar, “Discrete boundary layer current control for VSI - IM drive,” The IEEE Joint International Conference on Control Applications & International Symposium on Intelligent Control CCA/ISIC '01, México City, Mexico, pp. 339-344.

Peter Cafuta, Žarko Čučej, “Mapping and feedforward steering at direct current switching control of VSI feeding IM,” 9th Mediterranean conference on control and automation, Dubrovnik, Croatia, June 2001.

Amor Chowdhury, Peter Cafuta, Rajko Svečko, “Inward approach of the robust controller synthesis,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 201-204.

Marijan Španer, “Večosni robotski servoregulator,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 29-33.


Assoc. Prof. Dr. Peter Cafuta: Visits to Inst. for RT, University of Graz, Austria.

Institute of Mathematics and Physics MP – 1

INSTITUTE OF MATHEMATICS AND PHYSICS

Head:

Prof. Dr. France Brešar until Oct. 31, 2001 Prof. Dr. Vitodrag Kumperščak from Nov. 1, 2001

Phone: +386 2 220 73 80 Phone: +386 2 220 73 90

E-mail: [email protected] E-mail: [email protected]

URL: http://www.mp.feri.uni-mb.si

Members of the Institute of Mathematics and Physics are participating in research activities at the Faculty for Electrical Engineering and Computer Sciences and at the Institute for Mathematics, Physics, and Mechanics at the University in Ljubljana. Because our research work is not unilaterally organised, we are reporting on individual contributions.

MP – 2 Institute of Mathematics and Physics

Members of the Institute of Mathematics and Physics are organised into one laboratory.

Applied Mathematics Laboratory

Head: Prof. Dr. France Brešar (until Oct. 31, 2001), Prof. Dr. Vitodrag Kumperščak (from Nov. 1, 2001)

Employees: Assoc. Prof. Dr. Gorazd Lešnjak; Dr. Andrej Duh; Milan Kutnjak, MSc; Dr. Marjan Logar; Asst. Prof. Dr Tatjana Petek; Iztok Peterin, MSc; Jasna Petric, BSc; Aleksandra Tepeh, BSc

Applied Mathematics Laboratory

Head: Prof. Dr. France Brešar until Oct. 31, 2001

Prof. Dr. Vitodrag Kumperščak from Nov. 1, 2001

Institute of Mathematics and Physics

Head: Prof. Dr. France Brešar until Oct. 31, 2001

Prof. Dr. Vitodrag Kumperščak from Nov. 1, 2001

Applied Mathematics Laboratory MP – 3

APPLIED MATHEMATICS LABORATORY

Head:

Prof. Dr. France Brešar until Oct. 31, 2001, Prof. Dr. Vitodrag Kumperščak from Nov. 1, 2001

Phone: +386 2 220 73 80, +386 2 220 73 90

E-mail: [email protected], [email protected]

RESEARCH PROJECTS



P0-0510-0101 (B) Operator theory

Leader: Dr. Peter Šemrl Participants: Dr. Tatjana Petek et al.


This project is devoted to the study of Jordan homomorphisms, spectral properties (invertibility, spectral radius, quasinilpotents) preservers and comutativity preserving maps. We shall research the related problem of characterizing Lie homomorphisms.

P0-0508-0101 (B) Algebraic methods in operator theory

Leader: Dr. Matjaž Omladič Participants: Dr. Gorazd Lešnjak et al.


In this project we plan to study operators defined on real or complex Banach and Hilbert spaces and on Banach lattices as well as linear operators on finite dimensional vector spaces (matrices) over general fields.

Z1-3073-0101-01 Structural and algebraic properties of graph classes

Leader: Dr. Boštjan Brešar

MP – 4 Applied Mathematics Laboratory


Graph classes defined either by metric properties, by certain elimination procedures, or as subgraphs of product graphs are studied. The main focus is given to the research of structure of these graphs, as well as to the existence of subgraphs that are invariant under automorphisms or related maps.



J1-7483 (C) New measuring techniques and methods of magnetic resonance

Leader: Dr. Janez Stepišnik Participants: Dr. Andrej Duh et al.

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia Duration: Jan. 1, 1996 to June 30, 2001

Research and development of NMR spectroskopy and image system in Earth's weak magnetic field.

J1-0498 (B) Graph products and the metric theory of graphs

Leader: Sandi Klavžar Participants: Bošjan Brešar, Uroš Milutinović

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia Duration: July 1, 1998 to June 30, 2001

Study of graph products, their invariants and related problems.

PUBLICATIONS

Boštjan Brešar, “On Vizing's conjecture,” Discuss. Math., Graph Theory, Vol. 21, No. 1, pp. 5-11, 2001.

Boštjan Brešar, “Partial Hamming graphs and expansion procedures,” Discrete math., Vol. 237, No. 1-3, pp. 13-27, 2001.


Andrej Duh, Aleš Mohorič, Janez Stepišnik, “Computer simulation of the spin-echo spatial distribution in the case of restricted self-diffusion,” J. magn. reson., Vol. 148, pp. 257-266, 2001.

Gorazd Lešnjak, “A note on constrained convergence,” Linear algebra appl., Vol. 325, pp. 75-80, 2001.

Janez Stepišnik, Aleš Mohorič, Andrej Duh, “Diffusion and flow in a porous structure by the gradient spin echo spectral analysis,” Phys., B Condens. matter, Vol. 307, pp. 158-168, 2001.

Boštjan Brešar, Wilfried Imrich, Sandi Klavžar, “Fast recognition algorithms for classes of partial cubes,” Prepr. ser. - Univ. Ljubl. Inst. Math., Vol. 39, No. 736, pp. 1-12, 2001.

Boštjan Brešar, Sandi Klavžar, Riste Škrekovski, “Cubes polynomial and its derivatives,” Prepr. ser. - Univ. Ljubl. Inst. Math., Vol. 39, No. 745, pp. 1-11, 2001.

Andrej Duh, Vitodrag Kumperščak, Mirko Pšunder, “Deformations in moderately thick laminated plate loaded on both sides,” Advances in computational engineering & sciences ICES '01, Puerto Vallarta, Mexico, 6 pp.

Janez Stepišnik, Aleš Mohorič, Andrej Duh, “Molecular transport in a porous media by the Pulse-Gradient-Spin-Echo spectral analysis,” 14th Conference of the International Society of Magnetic Resonance ISMAR 2001, Rhodes, Greece, Aug. 2001, pp. 32.

Janez Stepišnik, Aleš Mohorič, Andrej Duh, “Molecular transport in a porous media by the Pulse-Gradient-Spin-Echo spectral analysis,” Second Conference on Field Cycling NMR Relaxometry: techniques, applications, theories, Torino, Italy, June 2001, pp. 13.

Marjan Logar, Robert Jeraj, Bogdan Glumac, “Criticality of spent fuel pool filled with burned FLIP fuel,” International Conference Nuclear Energy in Central Europe, Portorož, Slovenia, Sept. 2001, pp. 8-9.

Marjan Logar, Robert Jeraj, Bogdan Glumac, “Criticality of a spent fuel pool filled with burned FLIP fuel,” Nuclear Energy in Central Europe 2001, Portorož, Slovenia, Sept. 2001, pp. 111.

Marjan Logar, Robert Jeraj, Bogdan Glumac, “Criticality of spent fuel pool filled with burned FLIP fuel,” Proceedings of Nuclear Society of Slovenia, Ljubljana, Slovenia, pp. 111.1-8.

Boštjan Brešar, “Median-like classes: arboreal structure and cube graphs,” Abstracts for the Recent Trends in Graph Theory, Algebraic Combinatorics, and Graph Algorithms Conference, Bled, Slovenia, Sept. 2001, pp. 6.

MP – 6 Applied Mathematics Laboratory

Boštjan Brešar, Wilfried Imrich, Sandi Klavžar, Henry Martyn Mulder, Riste Škrekovski, “Tiled partial cubes,” Abstracts for the Recent Trends in Graph Theory, Algebraic Combinatorics, and Graph Algorithms Conference, Bled, Slovenia, Sept. 2001, pp. 31.

Iztok Peterin, Janez Žerovnik, “Distance in the direct product of graphs,” Abstracts for the Recent Trends in Graph Theory, Algebraic Combinatorics, and Graph Algorithms Conference, Bled, Slovenia, Sept. 2001, pp. 24.

Miran Horvat, Marjan Logar, Jože Voršič, “Verjetnostni izračun pretokov moči v tržnih razmerah,” peta konferenca slovenskih elektroenergetikov, Bled, Slovenia, May 2001, Part 2, pp. 38-35 - 38-42.

Stojan Peršin, Boris Tovornik, Gorazd Lešnjak, “Statistical Process Control (SPC),” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 45-51.

Miran Horvat, Marjan Logar, Jože Voršič, “Načrtovanje elektroenergetskega sistema ob nedoločenosti trga,” deseto Mednarodno posvetovanje Komunalna energetika, Maribor, Slovenia, May 2001, 10 pp.


Tatjana Petek, “Adjacency preserving maps on matrices and operators,” a talk at the All Ireland Algebra Days 2001, Belfast, Great Britain, May 2001.

Iztok Peterin, “Clique Helly number,” a talk at the CEEPUS Summer School, Ljubljana, Slovenia, June 2001.

Boštjan Brešar, “Cubes polynomial and its derivatives,” a talk at the EuroConference on Combinatorics, Graph Theory and Applications, Barcelona, Spain, Sept. 2001.

Boštjan Brešar, “Median-like classes: arboreal structure and cube graphs,” a talk at the Recent trends in Graph Theory, Algebraic Combinatorics, and Graph Algorithms, Bled, Slovenia, Sept. 2001.

Marjan Logar, “Criticality of a spent fuel pool filled with burned FLIP fuel,” a talk at the Nuclear Energy in Central Europe, Portorož, Slovenia, Sept. 2001.

Boštjan Brešar, “Cubes polynomial and its derivatives: the case of median graphs,” a talk at the Colloquium on Combinatorics, Braunschweig, Germany, Nov. 2001.


Aleš Mohorič, Janez Stepišnik, Andrej Duh, Gorazd Planinšič, Miha Kos, “An earth's magnetic field magnetic resonance imaging apparatus,” a poster at the 16th Waterloo NMR Summer School, University of Waterloo, 2001.


Asst. Prof. Dr. Tatjana Petek: Referee for Linear Algebra and Applications.

Assoc. Prof. Dr. Gorazd Lešnjak: Referee for Linear and Multilinear Algebra.


Assoc. Prof. Dr. Gorazd Lešnjak: Research visit at Department of Mathematics at KLTE, University of Debrecen, Hungary, Nov. 2001.

GUESTS AND VISITORS

Lajos Mólnar: Research visit of Professor from Department of Mathematics at KLTE, University of Debrecen, Hungary, Feb. 2001.

Institute of Computer Science CS – 1

INSTITUTE OF COMPUTER SCIENCE

Head:

Prof. Dr. Viljem Žumer

Phone: ++386 2 220 74 50


URL: http://www.cs.feri.uni-mb.si/rac/

The Institute of Computer Science has 42 employees, including 3 full professors, 2 associate professors, 4 assistant professors, assistants, researchers, and technical staff. The main activities of the Institute of Computer Science are teaching graduate and postgraduate courses and research work. Research work currently being performed includes the national program group Computer Systems, Methodologies and Cybernetic projects financed by the Ministry of Education, Science and Sport Republic of Slovenia, 4 fundamental research projects, 24 international projects, 3 research and development projects, 12 applied research projects, and 4 industrial projects.

During the past year, the institute has published more than 100 papers, presented a great deal of research work, and in addition, organised meetings, conferences, and visits to other institutions. The main research areas of the institute are: computer graphics, artificial intelligence, computer animation, multimedia, programming languages, computer architecture, medical informatics, software engineering, signal and image processing, and system software.

CS – 2 Institute of Computer Science

Members of the institute are divided into six laboratories and seven centres of technology.

Computer Graphics and Artificial Intelligence

Laboratory Head:

Prof. Dr. Nikola Guid

Computer Architecture and Languages

Laboratory Head:


System Design Laboratory

Head: Assoc. Prof. Dr. Peter Kokol

System Software Laboratory

Head: Prof. Dr. Damjan Zazula

Institute of Computer Science Head:


Heterogeneous Computer Systems Laboratory

Head: Asst. Prof. Dr. Milan Ojsteršek

Geometric Modelling and Multimedia Algorithms

Laboratory Head:

Assoc. Prof. Dr. Borut Žalik

Institute of Computer Science CS – 3

Computer Graphics and Artificial Intelligence Laboratory

Head: Prof. Dr. Nikola Guid

Employees: Simon Kolmanič, MSc; Damjan Strnad, MSc; Bogdan Lipuš; Karno Bozi

Centre for Computer Animation and Multimedia

Head: Prof. Dr. Niko Guid

Computer Architecture and Languages Laboratory


Employees: Asst. Prof. Dr. Marjan Mernik; Asst. Prof. Dr. Janez Brest; Mitja Lenič, MSc; Enis Avdičaušević, MSc; Robert Krušec; Damijan Rebernak; Borko Bošković

Centre for Programming Languages


System Design Laboratory


Employees: Dr. Špela Hleb - Babič; Dr. Vili Podgorelec; Dr. Milan Zorman; Matej Šprogar; Mitja Lenič, MSc

Centre for Medical Informatics


System Software Laboratory


Employees: Asst. Prof. Dr. Danilo Korže; Dr. Andrej Šoštarič; Dr. Dean Korošec; Dr. Božidar Potočnik; Boris Cigale, MSc; Aleš Holobar; Matjaž Divjak; Jurij Munda

Centre for Interactive Network Applications


CS – 4 Institute of Computer Science

Centre for Biomedical Signal and Image Processing


Heterogeneous Computer Systems Laboratory


Employees: Aleksander Kvas, MSc; Uroš Novak, MSc; Zlatko Čajič; Borut Gorenjak; Ervin Schaffranietz; Branko Horvat; Bojan Letnik

Centre for Heterogeneous Processing


Laboratory for Geometric Modelling and Multimedia Algorithms

Head: Assoc. Prof. Dr. Borut Žalik

Employees: David Podgorelec, MSc; Matej Gomboši; Sebastian Krivograd; Gregor Klanjšek; Mirko Zadravec

Centre for Geometric Modelling

Head: Assoc. Prof. Dr. Borut Žalik

Computer Graphics and Artificial Intelligence Laboratory CS – 5

COMPUTER GRAPHICS AND ARTIFICIAL INTELLIGENCE LABORATORY

Head:

Prof. Dr. Nikola Guid

Phone: +386 2 220 74 70


RESEARCH PROJECTS


Industrial project

SO3DA Seminar on fundamentals of 3D animation

Leader: Prof. Dr. Nikola Guid Participants: Simon Kolmanič, MSc; Karno Bozi

Financed by: Institute for support of civil society initiative and multicultural collaboration – Pekarna magdalenske mreže, Maribor, Slovenia

Computer animation has developed into an efficient communication tool, especially useful in the presentation of new products or services. Because of this fact, the Institute for Support of Civil Society initiative and Multicultural Collaboration contacted us to organize a seminar, where their co-workers and others interested in computer animation could hear something about the fundamentals of 3D animation. In addition the aim of the seminar was to prepare the promotional animation of this institute, which will be officially presented in public at the beginning of 2002.

PUBLICATIONS

Damjan Strnad, “Računalniška grafika,” Monitor, Vol. 11, No. 4, pp. 143-146, 2001.

Nikola Guid, Računalniška grafika. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

CS – 6 Computer Graphics and Artificial Intelligence Laboratory

Karno Bozi, “Core searching on rough sets,” 23rd international conference on information technology interfaces ITI 2001, Pula, Croatia, June 2001, pp. 217-222.

Bogdan Lipuš, “Modeli oblakov na osnovi gostote prostora,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. A, pp. 259-262.

Simon Kolmanič, Nikola Guid, “Odvoj poljubnih 3D ploskev s pomočjo strategije deli in vladaj,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 7-10.


Nikola Guid, “Računarska grafika. Krivulje i plohe u CAGD,” lecture for postgraduate studies at the Faculty of Electrical Engineering and Computer Science, Zagreb, Croatia, Nov. 19, 2001.

Nikola Guid, “Računarska grafika. Modeli osvetljavanja,” lecture for postgraduate studies at the Faculty of Electrical Engineering and Computer Science, Zagreb, Croatia, Dec. 17, 2001.


Prof. Dr. Nikola Guid: Facoltà di Ingegneria, Università degli Studi di Udine, Italia, Dec.12–13, 2001.

Computer Architecture and Languages Laboratory CS – 7

COMPUTER ARCHITECTURE AND LANGUAGES LABORATORY

Head:


Phone: +386 2 220 74 50


RESEARCH PROJECTS


Applied project

L2-3302-0796 Informacijski sistem za projektno vodenje proizvodnje v strojegradnji (Information system for the project oriented production of machinery and working tools)

Leader: Asst. Prof. Dr. Janez Brest Participants: Enis Avdičaušević MSc; Robert Krušec

Financed by: Ministry of Education, Sciece and Sport of the Republic of Slovenia, and Lestro Engineering d.o.o., Maribor, Slovenia

This project oriented production model in the field of woodworking machines is used for rapid production adaptation to market demands. To minimize the development time of the product, it takes the efforts of all participants, who have to be able to contribute to the product's development. Furthermore, the participants are required to manage all the modifications and adaptations. The main goal of this research is the design and implementation of an information system for the development, planning and control of the production process for machinery and working tools.

CS – 8 Computer Architecture and Languages Laboratory

Industrial project

Informacijski sistem za projektno vodenje proizvodnje v strojegradnji (Information system for the project oriented production of machinery and working tools)

Leader: Prof. Dr. Viljem Žumer Participants: Asst. Prof. Dr. Janez Brest, Damijan Rebernak, Borko Boškovič

Financed by: Lestro Ledinek Engineering d.o.o., Maribor, Slovenia

The main objective of this project is the implementation and upgrading of the information system which is currently used in woodwork manufacturing. The project has several phases in which the analyse of currently used information system is studied, after which the organization of database is made, and the information system is implemented. One of the project's aim is studying of the complexity of the production process and its implementation.


Generični, adaptivni in aspektno usmerjeni opis jezika (Generic, Adaptive and Aspect-Oriented Language Definitions)

Leader: Prof. Dr. Viljem Žumer, Prof. Dr. Guenter Riedewald Participants: Asst. Prof. Dr. Marjan Mernik; Mitja Lenič, MSc; Enis Avdičaušević,

MSc; Robert Krušec; Dr. Ralf Laemmel; Elke Tetzner; Wolfgang Lohmann

Financed by: Partly the Ministry of Education, Science and Sport of the Republic of Slovenia and German partner

The main objective of this project is to integrate generic, adaptive and aspect-oriented programming with attribute grammars in order to support the practical applicability of attribute grammars in the design and implementation of domain-specific languages (DSL) and other important application areas.

Avtomatsko generiranje programskih orodij iz formalnih specifikacij jezika (Automatic Generation of Language-Based Tools)

Leader: Prof. Dr. Viljem Žumer, Assoc. Prof. Dr. Pedro Henriques Participants: Asst. Prof. Dr. Marjan Mernik; Mitja Lenič, MSc; Enis Avdičaušević,

MSc; Robert Krušec; Matej Črepinšek; Dr. João Saraiva; Dr. José Ramalho; Maria João Pereira

Financed by: Partly the Ministry of Education, Science and Sport of the Republic of Slovenia and Portugal partner


The main aim of the project is to extend language definitions in such a manner that many other language-based tools can be generated and to automatically generate some of them. One of the language-based tools, which we would like to be automatically generated is an algorithm animator and program visualizer. Currently, algorithm animators and program visualizers are strongly language and algorithm oriented. In this project we would like to show that algorithm animators and program visualizators could also be language independent and automatically generated from extended language definitions.



Generično in modularno programiranje: FNC2/LISA (Generic and Modular Programming: FNC2/LISA)

Leader: Prof. Dr. Viljem Žumer, Dr. Didier Parigot Participants: Asst. Prof. Dr. Marjan Mernik; Mitja Lenič, MSc; Enis Avdičaušević,

MSc; Robert Krušec; Dr. Gilles Roussel; Remi Forax; Carine Courbis; Pascal Degenne; Alexandre Fau

Financed by: Proteus Duration: 1999 – 2001

The language design process should be supported by modularity and abstraction in a manner that allows incremental changes as easily as possible. This is one of the strategic directions of further research on programming languages. Since attribute grammars have proved useful in specifying the semantics of programming languages, modularity, reusability, and extensibility should be incorporated into attribute grammars. Object-oriented languages aim at high reusability and extensibility by introducing polymorphism and inheritance concepts. The goal of the project was to incorporate ideas of various programming paradigms into attribute grammars to achieve better reusability, modularity, and extensibility.

PUBLICATIONS

Enis Avdičaušević, Mitja Lenič, Marjan Mernik, Viljem Žumer, “AspectCOOL: An experiment in design and implementation of aspect-oriented language,” SIGPLAN not., Vol. 36, No. 12, pp. 84-94, Dec. 2001.

Viljem Žumer, Marjan Mernik, Principi programskih jezikov. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science, Computer Science Institute 2001.


Viljem Žumer, Janez Brest, Objektno programiranje v C++. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science, Computer Science Institute 2001.

Viljem Žumer, Janez Brest, Strukturirano programiranje v C++. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science, Computer Science Institute 2001.

Viljem Žumer, Janez Brest, Operacijski sistem LINUX-UNIX: začetni del. Ljubljana, Slovenia: Ministrstvo za šolstvo in šport, Zavod Republike Slovenije za šolstvo 2001.

Viljem Žumer, Marjan Mernik, Janez Brest, Robert Krušec, Enis Avdičaušević, Damijan Rebernak, Borko Boškovič, Operacijski sistem LINUX/UNIX: gradivo za nadaljevalni tečaj. Maribor, Slovenia: Ministrstvo za šolstvo in šport, Zavod Republike Slovenije za šolstvo 2001.

Viljem Žumer, Marjan Mernik, Janez Brest, Robert Krušec, Enis Avdičaušević, Damijan Rebernak, Borko Bošković, Programski jezik C: gradivo za tečaj: nadgradnja osnov C-N-11-01. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science, Computer Architectures and Languages Laboratory 2001.

Viljem Žumer, Marjan Mernik, Janez Brest, Robert Krušec, Mitja Lenič, Enis Avdičaušević, Damijan Rebernak, Borko Boškovič, Programski jezik C++: gradivo za tečaj. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science, Computer Architectures and Languages Laboratory 2001.

Marjan Mernik, Uroš Novak, Enis Avdičaušević, Mitja Lenič, Viljem Žumer, “Design and implementation of simple object description language,” 16th ACM syposium on applied computing, Las Vegas, USA, Mar. 2001, pp. 590-594.

Robert Krušec, Mitja Lenič, Marjan Mernik, Viljem Žumer, “Language development in a visual manner,” Proceedings, pp. 396-403.

Janez Brest, Viljem Žumer, “A comparison of the static task graph scheduling algorithms,” 23rd international conference on information technology interfaces ITI 2001, Pula, Croatia, June 2001, pp. 43-48.

Mitja Lenič, Enis Audičaušević, Marjan Mernik, Viljem Žumer, “Načrtovanje in implementacija programskih jezikov z uporabo večkratnega dedovanja atributnih gramatik,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 35-38.

Enis Audičaušević, Marjan Mernik, Viljem Žumer, “Aspektno usmerjeno programiranje,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 55-58.


Borko Boškovič, Damijan Rebernak, Janez Brest, Marjan Mernik, Viljem Žumer, “Orodje za izdelavo aplikacij v spletnem informacijskem sistemu,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 115-118.

Janez Brest, Silvo Roškar, Borko Boškovič, Damijan Rebernak, Viljem Žumer, “Algoritma za izračun sumarnih kosovnic v strojegradnji,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 127-130.

Enis Avdičaušević, Mitja Lenič, Marjan Mernik, Viljem Žumer, “Aspektno usmerjeno programiranje,” Objektna tehnologija v Sloveniji OTS 2001, Maribor, Slovenia, June 2001, pp. 259-269.


Marjan Mernik, “DSL and AOP: is there any relation?” invited lecture within the project entitled Automatic generation of language-based tools, at the University of Minho, Braga, Portugal, Nov. 29, 2001.


Asst. Prof. Dr. Marjan Mernik, Prof. Dr. Viljem Žumer:

Organization and mini-track chair and reviewers of “Domain-Specific Languages for Software Engineering”, HICSS-34 Hawaii International Conference on System Sciences, Maui, Hawaii, Jan. 3–6, 2001.

Asst. Prof. Dr. Marjan Mernik: ACM SIG APP Annual Business Meeting, Las Vegas, USA, March 12, 2001.

Asst. Prof. Dr. Marjan Mernik: Member of LDTA '01Organizing Committee, Programme Committee and reviewer for the 1st Workshop on Language Descriptions, Tools and Applications, Genoa, Italy, April 7, 2001.

Asst. Prof. Dr. Janez Brest: Reviewer for ITI '2001, 23rd International Conference Information Technology Interfaces, Pula, Croatia, June 19–22, 2001.


Asst. Prof. Dr. Marjan Mernik: Member of SCI/ISAS 2001 Organizing Committee and reviewer for the 5th world multiconference on systemics, cybernetics and informatics, Orlando, USA, July 22–25, 2001.

Asst. Prof. Dr. Marjan Mernik: Reviewer for Journal of Functional Programming.

Asst. Prof. Dr. Marjan Mernik: Reviewer for Science of Computer Programming.

Asst. Prof. Dr. Marjan Mernik: Guest Editor of Journal of Computing and Information Technology, special issue on “Domain-Specific Languages”.

Asst. Prof. Dr. Marjan Mernik: Reviewer for Journal of Computing and Information Technology.


Asst. Prof. Dr. Marjan Mernik: INRIA Sophia Antipolis, France, April 5–11, 2001.

Enis Avdičaušević, MSc: University of Rostock, Germany, Aug. 13–22, 2001.

Asst. Prof. Dr. Marjan Mernik: INRIA Sophia Antipolis, France, Sept. 25–29, 2001.

Asst. Prof. Dr. Marjan Mernik, Mitja Lenič, MSc:

University of Minho, Braga, Portugal, Nov. 24–29, 2001.

GUESTS AND VISITORS

Assoc. Prof. Dr. Pedro Henriques, Maria João Pereira (University of Minho, Portugal):

Joint research work, Sept. 10–13, 2001.

Prof. Dr. Guenter Riedewald, Wolfgang Lohmann (University of Rostock, Germany):

Joint research work, Oct. 15–29, 2001.

System Design Laboratory CS – 13

SYSTEM DESIGN LABORATORY

Head:

Assoc. Prof. Dr. Peter Kokol

Phone: +386 2 220 74 57


RESEARCH PROJECTS


Applied project

ORDIS Statistics and Basics of Research Work

Leader: Assoc. Prof. Dr. Peter Kokol Participants: Dr. Vili Podgorelec, Dr. Milan Zorman, Br. Špela Hleb Babič, Matej

Šprogar


The Laboratory for System Design organized an educational course for the Ministry for Education, Science and Sport.

Industrial project

SOM Statistical Analysis of Medical Data

Leader: Assoc. Prof. Dr. Peter Kokol Participants: Dr. Vili Podgorelec, Dr. Milan Zorman, Dr. Špela Hleb Babič, Matej

Šprogar

Financed by: General Hospital of Maribor, Health Center Adolf Drolc, Maribor, Slovenia

During various medical research huge medical data bases are created which are difficult to analyse using common statistical methods. Therefore the Laboratory for System Design provides comprehensive complex statistical analysis of such data to medical institutions.

CS – 14 System Design Laboratory


5th FP EUNITE, ref. No.: IST-2000-29207

European Network on Intelligent Technologies for Smart Adaptive Systems

Local Coordinator: Assoc. Prof. Dr. Peter Kokol Participants: Dr. Milan Zorman; Mitja Lenič, MSc Project partners: 22 European countries


The aim of the project is to encourage research in the field of adaptive systems in different areas. Our institution is involved in the design of adaptive intelligent systems in the field of medicine.

5th FP PLANET, ref. No.: IST-2000-29656

Network of Excellence in AI Planning



The aim of the project is to encourage research in the field of artificial intelligence and planning in different areas. Our institution is involved in the design of hybrid intelligent systems in the field of planning.

5th FP AgentLink II ref. No.: IST-1999-29003

Continuation of a Network of Excellence for Agent-Based Computing



The aim of the project is to encourage research in the field of agent technologies. Our institution is involved in the design of intelligent agent systems in the field of medicine.

HEMIS-J Heterogeneous Medical Intelligent Systems

Leader: Assoc. Prof. Dr. Peter Kokol, Prof. Dr. Ryouchi Yamamoto Participants: Dr. Špela Hleb Babič, Dr. Vili Podgorelec, Dr. Milan Zorman, Matej

Šprogar


Project partners: Osaka Medical College, Department of Medical Informatics, Osaka, Japan


The number and size of medical databases (electronic or manual) is increasing enormously. While providing great help for successful health care process they also contain much "hidden knowledge" not evident without careful and elaborate analysis. This statistical analysis and various computerised tools can be of great help, but often this is insufficient and more unconventional methods like intelligent systems should be performed. To be able to design successful medical intelligent systems (MIS) we must design them with appropriate design paradigms, one of them is MetaMet - a two levelled system design approach. Single methods like neural networks, evolutionary algorithms, decision trees and similar are quite successful in intelligence, they also have many weaknesses that can be solved by a combination of their uses – hybrid approach and the employment of the theory of chaos and complexity. Medical databases are normally distributed over several computers, institutions or even countries normally using different operating systems or protocols. In this way a heterogeneous approach has to be used. The additional advantage of heterogeneous computing is enlarged computational power that can be used to effectively execute the resource-consuming algorithms presented above.

ISCoMAA Intelligent Systems Construction by Multiple Autonomous Agents

Co-ordinators: Assoc. Prof. Dr. Peter Kokol, Prof. Dr. Lenka Lhotska Participants: Dr. Milan Zorman; Dr. Vili Podgorelec; Mitja Lenič, MSc; Matej

Šprogar Project partners: Czech Technical University of Prague


In order to design successful intelligent systems to be used in medical applications, we must design them with an appropriate design methodology. Therein lies another weakness–very few, if any, such methods exist in the world. Therefore the goals of our research are: • to develop successful design methods • to use these methods in designing real-world agent based intelligent medical systems.

SQUAB-M Physical Based Software Complexity Metrics

Leaders: Assoc. Prof. Dr. Peter Kokol, Prof. Dr. Miklos Biro Participants: Dr. Vili Podgorelec; Dr. Milan Zorman; Mitja Lenič, MSc; Matej

Šprogar Project partners: Computer and Automation Institute Hungarian Academy of Sciences,

Budapest, Hungary



SQUAB-P Physical Based Software Complexity Metrics

Leader: Assoc. Prof. Dr. Peter Kokol, Anna Isabel Cardoso Participants: Dr. Vili Podgorelec; Dr. Milan Zorman; Mitja Lenič, MSc; Matej

Šprogar Project partners: University of Madeira, Portugal


Reliability is one of the key issues in assuring the quality of software in complex systems. It is very important to economically and consistently assure the appropriate level of software reliability, because more and more activities and systems rely on software. One of the ways to assure software reliability is to use software complexity metrics. The development of software is a complex and complicated process, where we unintentionally make errors in the code. It has been proven that the pattern of making unintentional errors in code is related to measurable quantities of the code, especially those measured with software complexity metrics. For instance, large systems are made of different modules, where each module can be described by its attribute values. It could be very appropriate to predict the number of errors in the code, using these attribute values.

Both of our projects deal with researching the use of fractal software complexity metrics in predicting and evaluating the characteristics of software.

ORDIS Sistemi integracije inteligence v zdravstveno okolje

Leader: Assoc. Prof. Dr. Tatjana Welzer Družovec, Prof. Dr. Lorenzo Moreno Ruiz

Participants: Assoc. Prof. Dr. Peter Kokol, Asst. Prof. Dr. Marjan Družovec, Prof. Emeritus Dr. Bruno Stiglic, Boštjan Brumen, Dr. Špela Hleb Babič, Dr. Milan Zorman, Dr. Vili Podgorelec

Project partners: Centro Superior de Informatica Universidad de La Laguna - Tenerife

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, and Spanish Ministry for Foreign Affairs

Within the project we will study the simulation of hospital management. The basis of the simulation will be a data base containing data of administration, sources, schedules, employees, etc. Second part of the project represents a system for diagnosing Alzheimer disease based on the analysis of EEG signals. This analysis will be performed with the use of the symbolic description of EEG signal, soft automata, statistical analysis, and neural networks.


Intelligent Vaccination Support Systems

Co-ordinators: Assoc. Prof. Dr. Peter Kokol, Prof. Dr. Yves le Normand Participants: Dr. Milan Zorman; Dr. Vili Podgorelecč Mitja Lenič, MSc; Matej

Šprogar Project partners: University of Nantes, France

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, PROTEUS

The aim of this project is the design of intelligent systems for the support of vaccination prior to travelling to high-risk countries.



INCOMPETENT J2-0514-0796-98

Intelligent Computer Support for MetaMet

Leader: Assoc. Prof. Dr. Peter Kokol Participants: Dr. Vili Podgorelec, Dr. Milan Zorman, Dr. Špela Hleb Babič


Method Engineering is a recent development in software design that appears promising. Method Engineering is based on the emerging view that software design processes need to be engineered to fulfil the requirements of a design situation. The aim of the proposed project was to combine Method Engineering with MetaMet and to develop intelligent computerised support for their successful use. The tools developed were based on evolutionary programming, automated learning, and decision trees.

Applied projects

INSIST J2-1640-0796-99

Intelligent Systems in Medicine: The Case of Breast Feeding

Leader: Assoc. Prof. Dr. Peter Kokol Participants: Dr. Špela Hleb Babič, Dr. Milan Zorman, Dr. Vili Podgorelec Project partners: Healthcare Centre Adolf Drolc Maribor, UNICEF, INFONET Kranj,

Slovenia



The aim of this project was to research the development and applications of hybrid intelligent systems in medicine. Our main focus was on decision trees, neural networks, and evolutionary programming. All approaches were tested using the subject of breastfeeding, as one of the main goals of the project was to heighten awareness about extending the length of time mothers breastfeed their children. To collect data for the project, we published a Breast feeding booklet.

KALIMO Conceptual Networks

Leader: Assoc. Prof. Dr. Peter Kokol Participants: Dr. Vili Podgorelec, Dr. Milan Zorman, Dr. Špela Hleb Babič, Matej

Šprogar

Financed by: Ministry for Education, Science and Sport of the Republic of Slovenia Duration: 2001

Conceptual networks are frequently and successfully used in educational processes. In the framework of this project we developed a software package that supports the creation and use of conceptual networks.

INSIST-Z Popularisation of Breast Feeding

Leader: Assoc. Prof. Dr. Peter Kokol, Boris Topolovec Participants: Dr. Vili Podgorelec, Dr. Milan Zorman, Dr. Špela Hleb Babič, Matej

Šprogar Project partner: Top Foto

Financed by: Ministry of Health of the Republic of Slovenia Duration: 2001

The project advertised natural breast-feeding through a breast-feeding booklet and web site.


Tempus Phare ODIN AC_JEP-14045-1999

On-Demand Intranet For Nursing Education

Co-ordinator: Assoc. Prof. Dr. Peter Kokol Participants: Dr. Milan Zorman, Dr. Vili Podgorelec, Dr. Špela Hleb Babič, Matej

Šprogar


Project partners: University College of Nursing Studies Maribor, Healthcare Centre Adolf Drolc, Maribor, Slovenia, and University Of Athens, University of Naples, University of Sheffield

Financed by: European Union Duration: 1999 – 2001

The goal of this project was to enable improved health care for all at a cost lower than current EU standards. Our research resulted in more effective and efficient health care processes, which in turn was a consequence of better-educated nurses. Better education of nurses can be achieved through regular and continuing education supported by a computerised knowledge network (i.e. ODIN Intranet) respecting EU regulations and directives, "health enterprises" and governmental needs, and state-of-the-art nursing care.

INMES Intelligent Medical Systems

Co-ordinators: Assoc. Prof. Dr. Peter Kokol, Prof. Dr. Lenka Lhotska Participants: Assoc. Prof. Dr. Tatjana Welzer Družovec, Dr. Milan Zorman, Dr. Vili

Podgorelec, Dr. Špela Hleb Babič, Matej Šprogar Project partners: Czech Technical University of Prague


In order to design successful intelligent systems for use in medical applications, we must design them with an appropriate design methodology. Therein lies another weakness–very few, if any, such methods exist in the world. Therefore the goals of our research were: • to develop successful design methods • to use these methods in designing real-world intelligent medical systems that are also

based on hybrid approaches • to use these systems in a manner that "invents" new medical knowledge in selected

medical fields.

HEMIS-N Heterogeneous Medical Intelligent Systems on the Internet

Leader: Assoc. Prof. Dr. Peter Kokol, Prof. Dr. Christian Ohmann Participants: Dr. Milan Zorman, Dr. Vili Podgorelec, Dr. Špela Hleb Babič Project partners: Heinrich Heine University Duesseldorf, Department of General

Trauma and Trauma Surgery, Germany



One of the problems of medical data analysis is that the data is distributed in different departments, institutions, or even countries on different computers with different operating systems. This was the reason why we used heterogeneous computing through the WWW. An additional advantage of the heterogeneous approach is in an increase in computational power, which can be very helpful in cases of complicated analyses.

SQUAB-I New Software Complexity Metrics for Real World Applications

Leaders: Assoc. Prof. Dr. Peter Kokol, Dr. Maurizio Pighin Participants: Dr. Vili Podgorelec, Dr. Milan Zorman, Dr. Špela Hleb Babič, Matej

Šprogar Project partners: Matematica e Informatica, Universita di Udine, Italy


SQUAB-A Physical Based Software Complexity Metrics

Leader: Assoc. Prof. Dr. Peter Kokol, Rich DeLoch Participants: Dr. Vili Podgorelec, Dr. Milan Zorman, Dr. Špela Hleb Babič Project partners: General Electric, Erie, USA


Reliability is one of the key issues in assuring the quality of software in complex systems. It is very important to economically and consistently assure the appropriate level of software reliability, because more and more activities and systems rely on software. One of the ways to assure software reliability is to use software complexity metrics. The development of software is a complex and complicated process, where we unintentionally make errors in the code. It has been proven that the pattern of making unintentional errors in code is related to measurable quantities of the code, especially those measured with software complexity metrics. For instance, large systems are made of different modules, where each module can be described by its attribute values. It could be very appropriate to predict the number of errors in the code, using these attribute values.

Both of our projects dealt with researching the use of fractal software complexity metrics in predicting and evaluating the characteristics of software.

EVOBADEN Evolutionary Based Construction Of Decision Network

Leader: Assoc. Prof. Dr. Peter Kokol, Prof. Ole Hejlesen Participants: Dr. Vili Podgorelec, Dr. Milan Zorman, Dr. Špela Hleb Babič, Matej

Šprogar


Project partners: Aalborg University, Department of Medical Informatics, Aalborg, Denmark


The aim of this project was to enhance knowledge extraction from medical databases and thus firstly support more effective decision-making of medical personnel and secondly gain new medical knowledge. A new knowledge extraction/ data-mining paradigm has been designed and tried out on real world medical examples (data warehouses). A software environment has been built to try out various learning and evolution approaches, automatic programming techniques and different fitness functions.

PUBLICATIONS

Enis Avdičaušević, Mitja Lenič, Marjan Mernik, Viljem Žumer, “AspectCOOL: An experiment in design and implementation of aspect-oriented language,” SIGPLAN not., Vol. 36, No. 12, pp. 84-94, Dec. 2001.

Vili Podgorelec, Peter Kokol, “Towards more optimal medical diagnosing with evolutionary algorithms,” J. med. syst., Vol. 25, No. 3, pp. 195-219, 2001.

Milan Zorman, Vili Podgorelec, Peter Kokol, Margaret Peterson, Matej Šprogar, Milan Ojsteršek, “Finding the right decision tree's induction strategy for a hard real world problem,” International journal of medical informatics, Vol. 63, pp. 109-121, 2001.

Vili Podgorelec, Peter Kokol, “Evolutionary decision forests - decision making with multiple evolutionary constructed decision trees,” Problems in applied mathematics and computational intelligence (Mathematics and computers in science and engineering), pp. 97-103.

Peter Kokol, Špela Hleb Babič, Vili Podgorelec, Milan Zorman, Inteligentni sistemi. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Viljem Žumer, Marjan Mernik, Janez Brest, Robert Krušec, Mitja Lenič, Enis Avdičaušević, Damijan Rebernak, Borko Boškovič, Programski jezik C++. gradivo za tečaj. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science, Computer Architecture and Languages Laboratory 2001.

Ana Isabel Cardoso, Rui Gustavo Crespo, Peter Kokol, “An alternative way to measure software-a measure from complex systems theory,” World Multiconference on Systemics, Cybernetics and Informatics SCI 2001 and ISIS 2001, Orlando, USA, July 2001, Vol. 11, pp. 213-216.


Vili Podgorelec, Peter Kokol, Milan Zorman, Matej Šprogar, M. Pighin, “The operative constraints of software reliability prediction methods,” World Multiconference on Systemics, Cybernetics and Informatics SCI 2001 and ISIS 2001, Orlando, USA, July 2001, Vol. 11, pp. 229-234.

Marjan Mernik, Uroš Novak, Enis Avdičaušević, Mitja Lenič, Viljem Žumer, “Design and implementation of simple object description language,” 16th ACM syposium on applied computing, Las Vegas, USA, Mar. 2001, pp. 590-594.

Vili Podgorelec, Peter Kokol, Ryuichi Yamamoto, Gou Masuda, Norihiro Sakamoto, “Knowledge discovery with genetically induced decision trees,” International ICSC congress on Computational intelligence: methods and applications CIMA 2001, Bangor, Great Britain, June 2001, 7 pp.

Milan Zorman, Hans-Peter Eich, Peter Kokol, Christian Ohmann, “The influence of different databases to the accuracy of machine learning,” International ICSC congress on Computational intelligence: methods and applications CIMA 2001, Bangor, Great Britain, June 2001, 6 pp.

Vili Podgorelec, Milan Zorman, Peter Kokol, H.-P. Eich, C. Ohmann, “Cross-learning on multiple databases in the case of acute appendicitis,” 14th IEEE symposium on computer-based medical systems CBMS 2001, Bethesda, USA, July 2001, pp. 17-22.

Matej Šprogar, Peter Kokol, Milan Zorman, Vili Podgorelec, Lenka Lhotska, Jiøí Klema, “Evolving groups of basic decision trees,” 14th IEEE symposium on computer-based medical systems CBMS 2001, Bethesda, USA, July 2001, pp. 183-188.

Matej Šprogar, Peter Kokol, Milan Zorman, Vili Podgorelec, Lenka Lhotska, Jiøi Klema, “Notes on medical decision model creation,” Second international symposium Medical data analysis ISMDA 2001, Madrid, Spain, Oct. 2001, pp. 270-275.

Matej Šprogar, Peter Kokol, Milan Zorman, Vili Podgorelec, Ryuichi Yamamoto, Gou Masuda, Nrihiro Sakamoto, “Supporting medical decision with vector decision trees,” 10th World Congress on Medical Informatics MEDINFO 2001, London, Great Britain, Sept. 2001, 5 pp.

Milan Zorman, Hans-Peter Eich, Peter Kokol, Christian Ohmann, “Comparison of three databases with a decision tree approach in the medical field of acute appendicitis,” 10th World Congress on Medical Informatics MEDINFO 2001, London, Great Britain, Sept. 2001, pp. 1414-1418.


Peter Kokol, Viljem Brumec, Ana Habjanič, Paula Procter, Linda Nicklin, “Intelligent systems for nursing education,” 10th World Congress on Medical Informatics MEDINFO 2001, London, Great Britain, Sept. 2001, pp. 1047-1050.

Peter Kokol, Vili Podgorelec, Milan Zorman, Matej Šprogar, “An analysis of software correctness prediction methods,” Second Asia-Pacific Conference on Quality Software, Hong Kong, Dec. 2001, pp. 33-39.

Milan Zorman, Peter Kokol, “Helping clinicians with meta decision trees,” The International NAISO Congress on Information Science Innovation ISI 2001, Dubai, United Arab Emirats, Mar. 2001, 5 pp.

Peter Kokol, Milan Zorman, Hans-Peter Eich, Christian Ohmann, “The difficulties of decision trees in the diagnostic of acute abdominal pain,” The International NAISO Congress on Information Science Innovation ISI 2001, Dubai, United Arab Emirats, Mar. 2001, 6 pp.

Vili Podgorelec, Peter Kokol, “Evolutionary decision forests - decision making with multiple evolutionary constructed decision trees,” The WSES international conferences Neural network and applications NNA 2001, Fuzzy sets and fuzzy systems FSFS 2001, Evolutionary conputation EC 2001, Puerto De La Cruz, Spain, Feb. 2001, 7 pp.

Peter Kokol, Paula Procter, Ana Habjanič, Linda Nicklin, “ODIN: on-demand intranet for nurse education,” Nursing: a new era for action, Geneva, Switzerland, Vol. I, pp. 638.

Robert Krušec, Mitja Lenič, Marjan Mernik, Viljem Žumer, “Language development in a visual manner,” Proceedings, pp. 396-403.

Mitja Lenič, Enis Audičaušević, Marjan Mernik, Viljem Žumer, “Načrtovanje in implementacija programskih jezikov z uporabo večkratnega dedovanja atributnih gramatik,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 35-38.

Vili Podgorelec, Peter Kokol, “Oblikovanje inteligentnih sistemov in odkrivanje znanja z avtomatskim programiranjem,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 169-172.

Milan Zorman, Peter Kokol, “Redukcija iskalnega hiperprostora rešitev s hibridom grobih množic in nevronskih mrež,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 205-208.


Vili Podgorelec, Peter Kokol, Andrej Kunej, “Maintenance scheduling in nuclear power plant using genetic algorithms,” 6th International Symposium on Operational Research in Slovenia SOR '01, Preddvor, Slovenia, Sept. 2001, pp. 163-168.

Peter Kokol, Ana Habjanič, Dušanka Mičetić-Turk, Viljem Brumec, Ljudmila Kolenc, “ODIN: Evropski projekt izobraževanja informatike v zdravstveni negi,” Dnevi slovenske informatike, Portorož, Slovenia, Apr. 2001, pp. 370-373.

Alojz Tapajner, Peter Kokol, “Uporaba odločitvenih dreves pri napovedovanju gibanja tečajev vrednostnih papirjev,” Dnevi slovenske informatike, Portorož, Slovenia, Apr. 2001, pp. 520-528.

Enis Avdičaušević, Mitja Lenič, Marjan Mernik, Viljem Žumer, “Aspektno usmerjeno programiranje,” Objektna tehnologija v Sloveniji OTS 2001, Maribor, Slovenia, June 2001, pp. 259-269.

Milan Zorman, Peter Kokol, Mitja Lenič, “Inteligentni medicinski sistemi,” Seminar Informatika v zdravstvu, Ljubljana, Slovenia, Oct. 2001, 3 pp.

Ana Habjanič, Peter Kokol, “Evropski Tempus Phare projekt ODIN,” 3. kongres zdravstvene nege »Zdravstvena nega - okolje in viri«, Portorož, Slovenia, Sept. 2001, pp. 231.

Peter Kokol, Vili Podgorelec, Ryuichi Yamamoto, Gou Masuda, Norihiro Sakamoto, “Medical knowledge extraction via hybrid decision trees,” 11th European-Japanese Conference on Information Modelling and Knowledge Bases, Maribor, Slovenia, May 2001, pp. 378-385.

Ana Habjanič, Paula M. Procter, Mitja Lenič, Peter Kokol, “Nursing knowledge through distance learning,” 2nd International DETECH Workshop: Using technology in open and distance learning, Maribor, Slovenia, Sept. 2001, pp. 191-192.

Dean Korošec, Boris Cigale, Mitja Lenič, “Old course - refreshed approach: are we doing any better,” 2nd International DETECH Workshop: Using technology in open and distance learning, Maribor, Slovenia, Sept. 2001, pp. 153-159.


Vili Podgorelec, “Phisically Based Software Metrics,“ a talk in the framework of bilateral project, Udine, Italy, March 7, 2001.

Milan Zorman, Alojz Tapajner, "Miselni vzorci," a talk at Festival vzgoje in izobraževanja, Celje, Slovenia, April 12, 2001.


Milan Zorman, “Umetne nevronske mreže in njihova uporaba na primeru afazije,“ a talk at the Medical Centre of Ljubljana, Slovenia, May 9, 2001.

Milan Zorman, “Umetne nevronske mreže,“ a talk at the Faculty of Humanities, Ljubljana, Slovenia, May 11, 2001.

Peter Kokol, “Intelligent systems,” lecture at the Univesidad de la Laguna, Centro Superior de Informática, Spain, May 12–15, 2001.

Matej Šprogar, "Vector Based Medical Intelligent Systems," lecture at the Heinrich Heine University Duesseldorf, Department of General and Trauma Surgery, Duesseldorf, Germany, June 22, 2001.

Peter Kokol, Milan Zorman, “Inteligentni medicinski sistemi,” a talk at the seminar entitled Informatika v zdravstvu, within INFOS '01, Ljubljana, Slovenia, Oct. 25, 2001.

Peter Kokol, “Software metrics,” invited lecture at the Madeira University, Nov. 12–16, 2001.

Mitja Lenič, “Developing COOL and AspectCOOL using LISA system,” invited lecture in the framework of the project entitled Automatic generation of language-based tools at the University of Minho, Braga, Portugal, Nov. 29, 2001.

Peter Kokol, Mitja Lenič, Matej Šprogar, "Heterogeneous intelligent medical systems," presentation in the framework of bilateral project, Osaka, Japan, Dec. 12, 2001.

Milan Zorman, “Hybrud Intelligent Systems,” a talk at the occasion of the visit to Japan supported by the JSPS grant, Kyushu University, Fukuoka, Japan, Dec. 19, 2001.


Assoc. Prof. Dr. Peter Kokol: Steering committee of CBMS 2001, Bethesda, USA, June 2001.

Assoc. Prof. Dr. Peter Kokol, Dr. Milan Zorman:

Organization of invited session on conference CIMA 2001, Bangor, Great Britain, June 19–22, 2001.

Assoc. Prof. Dr. Peter Kokol, Dr. Vili Podgorelec:

Organization of invited session on conference ISC 2001, Orlando, USA, July 2001.

Assoc. Prof. Dr. Peter Kokol, Dr. Milan Zorman:

Organisation of the ODIN project meeting, Maribor, Slovenia, Sept. 2001.


Assoc. Prof. Dr. Peter Kokol, Dr. Milan Zorman, Dr. Vili Podgorelec:

Reviewer for the MEDINFO 2001 conference, London, Great Britain, Sept. 2001.

Assoc. Prof. Dr. Peter Kokol: Program committee of exibition “Vzgoja in izobraževanje 2001”, Ljubljana, Slovenia, Sept. 2001.


Organization of invited session on conference SMC 2001, Tuscon, USA, Oct. 2001.

Assoc. Prof. Dr. Peter Kokol, Alojz Tapajner:

Organization of the SDMI conference, Gozd Martuljk, Slovenia, Oct. 16–17 2001.

Assoc. Prof. Dr. Peter Kokol: Program committee of INFOS 2001, Ljubljana, Slovenia, Oct. 2001.

Assoc. Prof. Dr. Peter Kokol: Editorial board of the Applied Systems Studies journal, Kluwer.

Assoc. Prof. Dr. Peter Kokol: Editor-in-chief, Informatica Medica Slovenica.

Assoc. Prof. Dr. Peter Kokol: Editor, IEEE Computational Medicine Newsletter.

Assoc. Prof. Dr. Peter Kokol: President of consulting committee IEEE Working Group on Computational Medicine.

Assoc. Prof. Dr. Peter Kokol: Member of steering committee of the Slovene society for medical informatics (SDMI).

Assoc. Prof. Dr. Peter Kokol: Program committee of magazine Organizacija.

Assoc. Prof. Dr. Peter Kokol: Member of working group IMIA-WG on Nursing Informatics.

Assoc. Prof. Dr. Peter Kokol: Member of working group EFMI-WG on Nursing Informatics.

Assoc. Prof. Dr. Peter Kokol: Reviewer for IEEE Software.

Assoc. Prof. Dr. Peter Kokol: Reviewer for IEEE Computer.


Assoc. Prof. Dr. Peter Kokol: Editorial board of Virtual Medical World Magazine.

Assoc. Prof. Dr. Peter Kokol, Dr. Špela Hleb Babič:

Editor of the special issue of International Journal of Medical Informatics.


Editor of the special issue of Journal of Medical Systems.


Assoc. Prof. Dr. Peter Kokol: EU Meeting on Telecommunications, Brussels, Belgium, Feb. 22–26, 2001.

Assoc. Prof. Dr. Peter Kokol, Matej Šprogar:

EU Meeting on Telecommunications, Prague, Czech Republic, March 19–20, 2001.


Visit in the framework of bilateral project, Udine, Italy, March 5–9, 2001.


Project co-operation with General Electric, Chicago, USA, April 5–11, 2001.

Assoc. Prof. Dr. Peter Kokol: Visit in the framework of Soctares/Erasmus programme, University of La Laguna, Spain, May 12–15, 2001.


Visit in the framework of bilateral project, Czech Technical University of Prague, Czech Republic, June 2–5, 2001.

Matej Šprogar: Project HEMIS-N with the University of Duesseldorf, Germany, June 21–26, 2001.

Assoc. Prof. Dr. Peter Kokol: Projekt HEMIS-N with the University of Duesseldorf, Germany, June 23–25, 2001.

Assoc. Prof. Dr. Peter Kokol: Project collaboration with General Electric, San Francisco, USA, June 28 to July 2, 2001.

Assoc. Prof. Dr. Peter Kokol: Visit in the framework of bilateral project, University of Madeira, Portugal, July 10–19, 2001.


Assoc. Prof. Dr. Peter Kokol: Meeting of IEEE TC on CBMS, Washington, USA, July 21–30, 2001.

Assoc. Prof. Dr. Peter Kokol: Visit in the framework of the Soctares/Erasmus programme, University of Madeira, Portugal, Nov. 12–16, 2001.

Mitja Lenič, MSc: Visit in the framework of bilateral project Alma-Lisa, Braga, Portugal, Nov. 24–29, 2001.

Mitja Lenič, MSc, Matej Šprogar:

Project HEMIS-J at the Osaka Medical College, Japan, Dec. 8–14, 2001.

Assoc. Prof. Dr. Peter Kokol: Project HEMIS-J at the Osaka Medical College, Japan, Dec. 8–16, 2001.

Dr. Milan Zorman: The JSPS grant at the Osaka Medical College, Osaka, Japan, Nov. 8–18 and Dec. 21, 2001.

Dr. Milan Zorman: The JSPS grant and visit to the Kyushu University, Fukuoka, Japan, Dec. 19–20, 2001.

GUESTS AND VISITORS

Jose Luis Sanchez (University of La Laguna, Tenerife, Spain):

Socrates co-operation with Spain, June 22–29, 2001.

Umberto Giani (University of Naples, Italy), Paula Procter, Linda Nicklin (University of Sheffield, Great Britain):

TEMPUS ODIN project members meeting, Sept. 2001.

Miklos Biro, Eva Feuer, Tibor Remzso (University of Budapest, Hungary):

Visit within the scope of bilateral project with Hungary, Oct. 14, 2001.

System Software Laboratory CS – 29

SYSTEM SOFTWARE LABORATORY

Head:

Prof. Dr. Damjan Zazula

Phone: +386 2 220 74 80


RESEARCH PROJECTS



J3-2085-0334-01 Characteristic of the Dominant Follicle in Unstimulated Cycles

Leader: Prof. Dr. Veljko Vlaisavljević (Teaching Hospital of Maribor) Participants: Prof. Dr. Damjan Zazula, Dr. Dean Korošec, Dr. Božidar Potočnik,

Jurij Munda, Nicolas Sergent (Ecole Centrale de Nantes, France)


This project was accepted in 2000 for a duration of two and half years. Our contribution to the project consists in developing and implementing a computer program for the interpretation of ovarian B-ultrasound and Doppler images. The problem is very complex, owing to the high demands for automated object recognition in extra noisy environments.

In the first project year, we built a prototype for the automated follicle recognition computer-assisted estimation of blood quantity around a dominant follicle. In 2001, this application was further improved, we increased its robustness and flexibility under various calibration conditions encountered in the ultrasound recordings. More than 100 ultrasound examinations were analysed. Several patients were examined during a few consecutive days of their ovulation cycles. The outcomes are medically significant, especially because they mean a step further in selecting the right dominant follicle to ovulate.

CS – 30 System Software Laboratory


CoLoS Conceptual Learning of Science (American-European project)

Leader: Prof. Dr. Damjan Zazula Participants: Asst. Prof. Dr. Danilo Korže, Dr. Dean Korošec, Dr. Božidar

Potočnik, Matjaž Divjak, Aleš Holobar, Jurij Munda

Financed by: This project does not have permanent financial support

This is a permanent project, aiming to develop and construct software tools that would enhance comprehension of basic scientific fields (for example physics, chemistry, or computer science). Special emphasis has been placed on an intuitive approach and computer-assisted learning. In 2001, the System Software Laboratory staff focused on an upgrading of the teaching applets which were written by the students in previous years. However, the students additionally implemented a simple teaching simulator of communications in the computer networks. We have also improved several details of the virtual delivery room training tools and the virtual baby. Our previous year achievements were presented at the regular CoLoS meeting held at Alcazares near Murcia, Spain, in September 2001.

AREVIDERO Assessment and Revision of Virtual Delivery Room

Leader: Prof. Dr. Damjan Zazula Participants: Dr. Dean Korošec, Matjaž Divjak, Aleš Holobar


AREVIDERO project extends the work of VIDERO (Virtual Delivery Room) project whose main goal was to create a virtual environment in which a group of medical students or even doctors could perform virtual neonatal resuscitation. The AREVIDERO project concentrates on validation and verification of the VIDERO’s program code, improvement and extension of a newborn’s life signs, and practical evaluation of the virtual training environment in educational processes of neonatal medicine.

During last year we designed graphical simulation of the newborn’s peripheral cyanosis, implemented the newborn’s facial mimics, and graphically represented different student actions, such as applying blow-by-oxygen and chest compression. We accelerated the program module for motion tracking and improved robustness of navigation in the virtual world. In collaboration with the Hermes Softlab software company we extended Virtual Delivery Room with the speech recognition and synthesis which enables interactive voice control of the newborn’s life signs. The user is now able to navigate freely through the virtual room while verbally communicating with the life signs control system, i.e. applying some


action or retrieving the life sign values. Furthermore, we developed a model for control of the newborn’s life signs by a single variable and implemented a program tool for its validation. In physiological terms, this single control variable can be approximately related to the oxygen level in the blood. We also implemented a stand-alone program for tuning and validation of this model – VIDERO Simulator and Animator. Introduction of this approach seems necessary for the purpose of supervised training. The mechanism is now under evaluation and has not yet been built into the current version of VIDERO. All other improvements were successfully installed at Stanford University, School of Medicine in Palo Alto, USA, where their medical students will test them.

NEW Neuromuscular Assessment in the Elderly Worker

Leader: Prof. Dr. Damjan Zazula Participants: Dr. Dean Korošec, Aleš Holobar

Financed by: The 5th Framework Programme of EU

As people age their neuromuscular system deteriorates causing pain, slowing of responses, reduced working ability. There is a need to monitor this phenomenon in order to prevent it and reduce its consequences by providing greater protection to the most vulnerable individuals. The NEW project focuses on the non-invasive assessment of muscle properties through the information extracted from the electrical (surface EMG) and mechanical (MMG) signals generated by muscle contractions.

Our laboratory is responsible for extraction of information from the raw signals detected on the muscles, specifically for the decomposition of surface EMG signals. In last year we developed the decomposition techniques that are based on the optimisation of non-linear system of equations using higher-order statistics. A lot of attention was paid to the properties of the excitation pulse trains in the theoretical surface EMG model. We also developed and tested the procedures for blind source separation and deconvolution of pulsed sources by utilizing the known approach of joint diagonalization of spatial time-frequency distribution matrices of the observed signals.



DETECH Development of the Department for Technology-Supported Distance Education (Participation in Tempus Phare project)

Leader: Asst. Prof. Dr. Matjaž Debevc Participant: Dr. Dean Korošec


Financed by: European Union, Tempus Office Duration: 1999 – 2001

The main goal of the DETECH project has been the development of the Department for Technology-Supported Distance Education within the Centre for Distance Education Development at the University of Maribor. Its offers operational and technological service as well as consultation in the field of open and distance learning. The department has now grown to become a part of the Institute for New Media and Distance Education Technologies at the University of Maribor.

Members of the System Software Laboratory participated in this project by (a) offering expertise in the field of software supported conceptual learning, (b) setting up of the technological services of the Centre for Distance Education Development and (c) organising project meetings.

PUBLICATIONS

Božidar Potočnik, Damjan Zazula, “Assessing the efficiency of the image segmentation algorithms,” Electrotechnical Review, Vol. 68, No. 2/3, pp. 97-104, 2001.

Božidar Potočnik, Damjan Zazula, “Modelling artificial ultrasound images of ovaries,” Electrotechnical Review, Vol. 68, No. 4, pp. 186-191, 2001.

Ana Vovk Korže, Danilo Korže, “Landscape units in Northeastern Slovenia,” Journal of Balkan ecology, Vol. 4, No. 2, pp. 152-160, 2001.

Dean Korošec, “Matematični kralj v novi preobleki,” Monitor, Vol. 11, No. 2, pp. 54-55, Feb. 2001.

Matjaž Divjak, Danilo Korže, “Visual and audio communication between visitors of virtual worlds,” The WSES international conferences Neural network and applications NNA 2001, Fuzzy sets and fuzzy systems FSFS 2001, Evolutionary conputation EC 2001, Puerto De La Cruz, Spain, Feb. 2001, pp. 41-46.

Aleš Holobar, Damjan Zazula, “Improved control of events in the VRML 2.0 application,” 6th Euromedia conference 2000, Valencia, Spain, Apr. 2001, pp. 67-71.

Dean Korošec, L.P. Halamek, Damjan Zazula, “Making virtual baby alive,” 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology and Biology Society, Istanbul, Turkey, Oct. 2001, 4 pp.


Danilo Korže, Marjan Krašna, “Distance education and multimedia information systems,” 5th WSES International Conference on Circuits, Systems, Communications and Computers CSCC 2001, 3rd WSES International Conference on Mathematics and Computers in Physics MCP 2001, 3rd WSES International Conference on Mathematics and Computers in Mechanical Engineering MCME 2001, Rethymno, Greece, July 2001, pp. 265-268.

Damjan Zazula, Nicolas Sergent, Veljko Vlaisavljevič, “Automated estimation of blood volume around the ovarian follicles,” 5th WSES International Conference on Circuits, Systems, Communications and Computers CSCC 2001, 3rd WSES International Conference on Mathematics and Computers in Physics MCP 2001, 3rd WSES International Conference on Mathematics and Computers in Mechanical Engineering MCME 2001, Rethymno, Greece, July 2001, pp. 145-150.

Matjaž Divjak, Damjan Zazula, Danilo Korže, Dean Korošec, “Spatialized streaming audio in multi-user virtual training environments,” GRETSI '01, Toulouse, France, 4 pp.

Matjaž Debevc, Dean Korošec, “Video supported web learning,” World Conference on Educational Multimedia, Hypermedia and Telecommunications ED-MEDIA 2001, Tampere, Finland, June 2001, pp. 381.

Damjan Zazula, Dean Korošec, Danilo Korže, Matjaž Divjak, Aleš Holobar, Iztok Prelog, Boris Cigale, Božidar Potočnik, Luis P. Halamek, Zvonko Fazarinc, “Virtual delivery room (VIDERO): Faculty of electrical engineering and computer,” Finalists of Stockholm Challenge Award 2001, pp. 22.

Matjaž Debevc, Dean Korošec, “The role of the department for technology supported distance education in Slovenian school environment,” The future of learning - learning for the future: shaping the transition, Hagen, 6 pp.

Matjaž Divjak, Aleš Holobar, Iztok Prelog, “VIDERO - virtual delivery room,” Technical Program, Bratislava, Slovakia, Vol. 1, pp. LIV.

Dean Korošec, Damjan Zazula, Matjaž Debevc, “Tools and toys for learning with the Web - examples from electrical engineering, computer engineering and medicine,” Internet based education, Bratislava, Slovakia, 1 pp.

Ana Vovk Korže, Danilo Korže, “Uporaba računalniških metod v fizični geografiji: (na primeru pedogeografije): (in the area of pedogeography),” Česká geografie v období rozvoje informačních technologií ČGS 2001, Olomouc, Czech Republic, Sept. 2001, pp. 189-194.

Damjan Zazula, “Experience with surface EMG decomposition using higher-order cumulants,” Signal Processing 2001, Poznañ, Poland, Oct. 2001, pp. 19-24.


Božidar Potočnik, Damjan Zazula, “Suppressing the system error in the measurement model of the prediction-based object recognition algorithm: ovarian follicle detection case,” 2nd international symposium on image and signal processing and analysis in conjunction with 23nd int'l conference on information technology interfaces ISPA 2001, Pula, Croatia, June 2001, pp. 196-201.

Matjaž Divjak, Danilo Korže, “The use of streaming audio in VRML enviroments,” 23rd international conference on information technology interfaces ITI 2001, Pula, Croatia, June 2001, pp. 167-172.

Aleš Holobar, Damjan Zazula, “Conceptual learning of cardiac anomalies and surgeries,” 23rd international conference on information technology interfaces ITI 2001, Pula, Croatia, June 2001, pp. 181-186.

Danilo Korže, Damjan Zazula, Dean Korošec, Matjaž Divjak, Aleš Holobar, Iztok Prelog, “Virtual delivery room as a teaching tool,” IX Mediterranean Conference on Medical and Biological Engineering and Computing MEDICON 2001, Pula, Croatia, June 2001, Vol. 1, pp. 476-479.

Aleš Holobar, Franjo Pernuš, Damjan Zazula, “Detekcija robov na slikah s pegastim šumom - algoritem palčk,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 277-280.

Božidar Potočnik, Damjan Zazula, “Predikcijski algoritem - segmentacijski algoritem za poljubna zaporedja slik,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 313-316.

Jurij Munda, Damjan Zazula, Nicolas Sergent, “Orodje za avtomatizirano 3D analizo jajčnih mešičkov,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 339-342.

Eric Plévin, Damjan Zazula, “Surface EMG signals decomposition via higher-order statistics (HOS) methods,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 355-358.

Božidar Potočnik, Damjan Zazula, “Učna orodja za vrednotenje zmogljivosti računalniških sistemov,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 389-392.

Dean Korošec, Matjaž Debevc, “Pretočni video za izobraževanje,” Mednarodna izobraževalna računalniška konferenca - MIRK 2001, Piran, Slovenia, May 2001, pp. 195-200.


Andrej Šoštarič, “SMS - fun or something more,” TELEINFOS, Ljubljana, Slovenia, May 2001, 15 pp.

Dean Korošec, Boris Cigale, Mitja Lenič, “Old course - refreshed approach: are we doing any better,” 2nd International DETECH Workshop: Using technology in open and distance learning, Maribor, Slovenia, Sept. 2001, pp. 153-159.


Božidar Potočnik, “Avtomatska analiza zaporedij ultrazvočnih slik jajčnikov: segmentacija statističnih 2D slik,” lecture at the SDRV seminar, Faculty of Electrical Engineering, Ljubljana, Slovenia, Feb. 28, 2001.

Damjan Zazula, “Presentation of the system software laboratory team, University of Maribor, Slovenia,” presentation at the 1st NEW meeting, Torino, Italy, March 31 till April 1, 2001.

Božidar Potočnik, “Avtomatska analiza zaporedij ultrazvočnih slik jajčnikov: razpoznavanje objektov iz zaporedja slik s postopki predikacije,” lecture at the SDRV seminar, Faculty of Electrical Engineering, Ljubljana, Slovenia, April 11, 2001.

Damjan Zazula, Aleksander Vreže, Božidar Potočnik, Aleš Holobar, Joseph DiCarlo, Zoltan Sep, Dean Korošec, Matjaž Divjak, Boris Cigale, Danilo Korže, “Teachware and VIDERO Improvements,” a talk at the CoLoS Meeting 2001, Murcia, Spain, Sept. 13–15, 2001.

Ana Vovk Korže, Danilo Korže, “Computational procedures in physical geography - in the area of pedogeography,” a talk at the Conference on Česká geografie v období rozvoje informačních technologií, Olomouc, Czech Republic, Sept. 25–27, 2001.

Dean Korošec, “Streaming technology - introduction and concept,” invited lecture at the University of Oulu, Faculty of Education, Finland, Sept. 2001.

Dean Korošec, Matjaž Debevc, “Informacijske tehnologije za študij na daljavo in nove oblike tradicionalnega izobraževanja,” a talk at the colloquium entitled Dnevi računalniškega centra Univerze v Mariboru, Maribor, Slovenia, Oct. 17–19, 2001.


Dr. Dean Korošec: Projekt TEMPUS DETECH: TELAB, Institute of Computer Technology, Faculty of Electrical Engineering, University of Technology, Vienna, Austria, Feb. 7–10, 2001.


Dr. Dean Korošec: Meeting organisation and leading of the Tempus DETECH group, Maribor, Slovenia, Feb. 22–24, 2001.

Dr. Dean Korošec: Centre for Distance Education Development, Fernuniversität Hagen, Germany, March 26 to Apr. 4, 2001.

Dr. Dean Korošec: Open University, Milton Keynes, England, May 23–28, 2001.

Dr. Dean Korošec: Organizacija mednarodne delavnice Tempus DETECH 2001 “'Using Technology in Open and Distance Learning”, Maribor, Slovenia, Sept. 13–14, 2001.

Prof. Dr. Damjan Zazula, Dr. Dean Korošec:

Arrangement and presentation of the Virtual Delivery Room prototype at the Stockholm Challenge Award exhibition; Stockholm, Sweden, Sept. 22–27, 2001.

Dr. Dean Korošec: Research Unit for Educational Technology, Faculty of Education, Oulu, Finland, Sept. 27–29, 2001.

Boris Cigale, MSc, Jurij Munda, Dr. Božidar Potočnik, Asst. Prof. Dr. Danilo Korže, Dr. Dean Korošec:

Arrangement and putting-up of the exhibition area for the Faculty of EE and CS (FERI) of Maribor at the INFOS 2001 exhibition. The Virtual Delivery Room prototype was exhibited too, while its speech-controlled version was developed and presented together with Hermes Softlab; Ljubljana, Slovenia, Oct. 21–25, 2001.

Prof. Dr. Damjan Zazula: Reviewer for Elsevier Signal Processing.

Prof. Dr. Damjan Zazula: Reviewer for IEEE Transactions on Biomedical Engineering.


Aleš Holobar: A visit to the LiSiN lab in the framework of the NEW


project, Politecnicno di Torino, Italy, May 14 to June 9, 2001.

Prof. Dr. Damjan Zazula, Dr. Dean Korošec:

Visit to the Stockholm Children Hospital, getting acquainted with their approach to the training of medical students in neonatal resuscitation and exchange of information with the Swedish training co-ordinator Prof. Dr. Anders Dahlström about the importance of virtual computer environments for the medical training; Stockholm, Sweden, Sept. 26, 2001.

Aleš Holobar, Matjaž Divjak:

A visit to IRCCyN in the frame of the NEW project, Ecole Centrale de Nantes, France, Oct. 1–30, 2001.

Prof. Dr. Damjan Zazula: A visit to the Institut de Recherche en Communication et Cybernetique de Nantes (IRCCyN); collaboration in the framework of the NEW project, Nantes, France, Oct. 14–19, 2001.

GUESTS AND VISITORS

Eric Plévin (Ecole Centrale de Nantes, France):

Postgraduate research work in the frame of “Surface EMG decomposition via HOS methods”; April 16 to Aug. 17, 2001.

Prof. Dr. Zvonko Fazarinc (HP Labs, Palo Alto, USA):

Research work in conjunction with the AREVIDERO project, Dec. 2001.


Aleš Holobar, Best Paper Award, Euromedia 2001 international conference, Valencia, Spain, Apr. 18–20, 2001.

Matjaž Divjak, Aleš Holobar, Iztok Prelog, the 3rd Place Award for the best student paper in the final competition of student papers of the IEEE Region 8. Honoured in the frame of EUROCON 2001 international conference, Bratislava, Slovakia, July 5–7, 2001.

System Software Laboratory, qualified the VIDERO project among 100 finalists of


Stockholm Challenge Award 2001 - Global Arena for Pioneering IT Projects, Stockholm, Sweden, Sept. 23–26, 2001.

System Software Laboratory, The Faculty Award for participation in the EU Fifth Framework Programme. Honoured at the celebration of the Day of the Faculty of Electrical Engineering and Computer Science, Maribor, Slovenia, Nov. 27, 2001.

Matjaž Divjak, Aleš Holobar, Iztok Prelog, The Faculty Award for research achievements. Honoured at the celebration of the Day of the Faculty of Electrical Engineering and Computer Science, Maribor, Slovenia, Nov. 27, 2001.

Heterogeneous Computer Systems Laboratory CS – 39

HETEROGENEOUS COMPUTER SYSTEMS LABORATORY

Head:

Asst. Prof. Dr. Milan Ojsteršek

Phone: +386 2 220 74 51


RESEARCH PROJECTS



Ogrodje za avtomatsko persistenco objektov v relacijski podatkovni bazi (Framework for Automatic Object Persistence in Relational Database)

Leader: Asst. Prof. Dr. Milan Ojsteršek Participants: Zlatko Čajić, Borut Gorenjak, Bojan Letnik, Ervin Schaffranietz,

Branko Horvat

Financed by: internal funding

Most modern distributed enterprise systems have been developed using an object oriented programming language and a relational database to store data. This kind of set-up causes considerable development problems because of impedance mismatch between objects and relational calculus. For this reason some sort of object to relational mapping is needed. The solution is a special framework for automatic object persistence in the relational database. In order to achieve automatic mapping, a framework-mapping scheme has to be defined in such a way that takes into account ease of use and performance issues. The framework-mapping scheme defines how an object is represented and stored in the relational database, and it should facilitate full object oriented properties like inheritance, polymorphism, objects’ aggregations and associations. The model describes mappings between objects and relational database based on the framework-mapping scheme. The model is composed in a modelling tool, which provides several other key functions that add the possibility of round-trip engineering design evolution. We have developed an Experimental XSLT processor for objects (EXPO), which perform mapping between object models and XML documents based on XSLT stylesheets.

CS – 40 Heterogeneous Computer Systems Laboratory

Applied projects

Maribor – town of knowledge

Leader: Asst. Prof. Dr. Milan Ojsteršek Participants: B. Gorenjak, U. Novak


Software, realized within the project, makes it possible to present educational opportunities in the Maribor and Drava region on the Internet. This offer includes the possibilities for education, offered to members of the community by different companies, outside regular education. Data on educational opportunities is entered by interested organizations themselves by means of special software. Web application enables printout of data on educational activities (sorted by types of programme, by performers, by months, when educational activities are performed), search on educational activities (criteria is title, place, type of programme, date, performer, location) and search on performer (criteria is title and place). Data on educational activities, offered by others, can by downloaded to the computer of any person who is entering the data.

Izdelava strateškega plana informatizacije mestne uprave Mestne občine Maribor

Leader: Asst. Prof. Dr. Milan Ojsteršek Participants: Branko Horvat

Financed by: Municipality of Maribor

Our goal is to create a strategic information technology plan for the Municipality of Maribor. This plan will use current state of the municipality’s IT development to further activities by introducing electronic commerce and to devise a plan of software development in the future.


Informacijski sistem za predstavitev mest na elektronskih medijih (Information Systems for City Representations on Electronic Media)

Leader: Asst. Prof. Dr. Milan Ojsteršek Participants: A. Kvas, Z. Čajić, B. Letnik, B. Gorenjak, B. Šorgo, E. Schaffranietz

Financed by: Municipality of Maribor, Municipality of Koper, Municipality of Sežana, Municipality of Radovljica, Municipality of Oplotnica, Municipality of Kungota, Slovenia


We have created the framework for building Web-based information systems. This framework is based on a set of rules that define a general data storage model independent of the underlying database management system. A set of high-level data types, customised and optimised for use in the World Wide Web (WWW) environment, has been defined for the general data storage model. The benefits of using this framework are independent design and content management, multilingual support, independence from the database management system, and automatic support for multimedia information. Current implementation of the framework is based on RDB. This framework has been used to develop city information systems for the cities of Maribor and Ljubljana. The information is collected from organisations, companies, users of the information system, and other Internet and database servers. The information is currently used for presentation on the Internet, on infoterminals, on cable TV, and on teletext. In year 2001 we have built portals of municipalities of Koper, Sežana, Radovljica, Oplotnica and Kungota.

Web user interface (left) and Wap user interface (right).

Portal “Sraka.com”

Leader: Asst. Prof. Dr. Milan Ojsteršek Participants: A. Kvas, Z. Čajić, B. Letnik, B. Gorenjak, B. Šorgo, E. Schaffranietz,

B. Horvat

Financed by: University of Maribor, Nova Kreditna banka Maribor, Ministry of Information Technology of the Republic of Slovenia

Information portal simplifies the creation, integration and management of information contents and by that increases the usability and efficiency of the stored data so that users spend less time on searches and more on information use and analysis. Also this simplifies


administration and user management.

Basic features are: • Document management • Search facility • Integration of our internal services with external information systems • Cross referencing of data and services • Information categorization • Independency of data to different user interfaces and electronic media • Multi language support • Authorization of access to data and services • Content and user interface personalization.

We have developed our own authentication system and integrated it with the portal this year. The authentication service is based on a LDAP directory service to store user information, access control lists and permissions. The system has been used as a portal at University of Maribor, at Faculty of Electrical Engineering and Computer Science, at ELISA (Electronic Information Service of the Rector’s Conference of Alps-Adriatic Universities), at Nova KBM bank as an internal portal.


Applied projects

Prenova akademskega podsistema informacijskega sistema Univerze v Mariboru (Modernisation of the Academic Information System at the University of Maribor)

Leader: Asst. Prof. Dr. Milan Ojsteršek Participants: E. Schaffranietz, B, Horvat

Financed by: University of Maribor, Slovenia Duration: 1999 – 2001

The University of Maribor began modernising its information systems in 1999. Our staff have been responsible for the requirements analysis of the academic system. The most important function of the system is to secure the continuous operation of the educational process, where the main emphasis is on accurate and up-to-date storage of students’ registration and examinations. The academic system must offer efficient service to university administration staff, students, faculty, Ministry of Education, National Statistics Bureau and others who need information from the students’ registration database (Student Housing Services, Employment Bureau). In addition, the system must support easy integration with international student


exchange schemes, tracking of educational process quality and the presentation of the university’s programs and classes on various electronic media.

Računalniška podpora kontroli ekološkega kmetovanja (Computer-Aided Controlling of Ecological Farming.)

Leader: Asst. Prof. Dr. Milan Ojsteršek Participants: E. Schaffranietz, A. Bregant, U. Novak, Z. Čajić

Financed by: Kmetijski zavod Maribor and PHARE Duration: 2000 – 2001

Farmers, who want to trade their crops, products or meat as ecological products, have to breed, grow or produce them in a way that meets strict ecological criteria. On a farm inspection a qualified controller can determine whether the inspected farm meets all required criteria. Without a good computer-aided support all needed data is uncontrollable and non-transparent. At this current stage we produced a distributed application that supports printing, statistical reports and data manipulation of data needed at ecological farming, like the data of potential clients, farmers and their farms, their animals, cultures and products; contacts with farmers, employees, controllers and their knowledge on different areas of farm inspection and ecological farming.

PUBLICATIONS


Milan Ojsteršek, Uroš Novak, Zlatko Čajić, Borut Gorenjak, “How to built an E-City,” Technical Program, Bratislava, Slovakia, Vol. 1, pp. 145-148.

Ervin Schaffranietz, Zlatko Čajić, Milan Ojsteršek, “Blacksmith: implementacija aplikacij z objektno-relacijskim preslikovalnim ogrodjem,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 123-126.

Branko Horvat, Milan Ojsteršek, “Vpetost uporabnika v podatkovno rudarjenje,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 131-134.

Milan Ojsteršek, “Informacijski sistem mest na elektronskih medijih,” TELEINFOS, Ljubljana, Slovenia, May 2001, 19 pp.


Milan Ojsteršek, Zlatko Čajić, Uroš Novak, Borut Gorenjak, “Kako zgraditi E-mesto,” mednarodna konferenca Človeku prijazna tehnološko popolna informacijska družba, Nova Gorica, Slovenia, Sept. 2001, pp. 175-182.

Zlatko Čajić, Ervin Schaffranietz, Uroš Novak, Albin Bregant, Milan Ojsteršek, “Implementacija aplikacij z ogrodjem Blacksmith,” Objektna tehnologija v Sloveniji OTS 2001, Maribor, Slovenia, June 2001, pp. 84-91.


Asst. Prof. Dr. Milan Ojsteršek: Technical University of Munich (Germany).

Geometric Modelling and Multimedia Algorithms Laboratory CS – 45

GEOMETRIC MODELLING AND MULTIMEDIA ALGORITHMS LABORATORY

Head:

Assoc. Prof. Dr. Borut Žalik

Phone: +386 2 220 74 71


RESEARCH PROJECTS



Valvazor/ALIS ALIS 63

Application of Computational Geometry in Visualisation of Medical Data

Co-ordinators: Assoc. Prof. Dr. Borut Žalik, Prof. Dr. Gordon Clapworthy Participants: David Podgorelec, MSc; Matej Gomboši Project partner: De Montfort University, Kents Hill, United Kingdom

Financed by: Ministry of Science and Technology of the Republic of Slovenia, British Council Slovenia

Visualisation of medical data deals with a huge amount of data obtained from different medical devices. This data has normally been presented to radiologists as two-dimensional “slices”. Nowadays, the data contained in the slices are frequently synthesised with the aid of computer graphics, so that the anatomical structures can be displayed in three-dimensional form. This use of computer graphics enables the three-dimensional relationships between various organs and their pathologies to be displayed, providing much greater awareness of the spatial features of the organs displayed. Developed in computational geometry is also needed besides the algorithms from computer graphic techniques. For example, Voronoi diagrams can be used to locate rapidly the nearest healthy cells when regarding those cells infected by some illness. It is anticipated that the expertise of the Slovene group in geometric modelling will enable even more economical algorithms to be developed to enhance the current work of the UK group. In return, the Slovene group will gain expertise in medical visualisation and will instigate work in this area, which currently, is not widely undertaken in Slovenia. This project will be concluded in 2002.

CS – 46 Geometric Modelling and Multimedia Algorithms Laboratory



2811-01-00042 Visualisation of huge 3D data sets via internet

Leader: Assoc. Prof. Dr. Borut Žalik Participants: David Podgorelec, MSc; Matej Gomboši; Sebastian Krivograd

Financed by: Ministry of Information Society of the Republic of Slovenia Duration: Sept. 14, 2001 to Dec. 31, 2001

The goal of the project was to develop a solution for a system able to transmit over the internet and visualise a huge amount of geometric data for making flying over in real time. Today’s communication canals do not allow transmission of a large data set in a real time, and besides this, visualisation of such amount of data can cause additional problems. The proposed solution consists of three steps: data preparation (presenting data with a triangular mesh, mesh decimation, data division into several resolution models, compression of these models), data transmission from a server to a client, and receiving the data on the client’s side and their visualisation. It was proved right that relatively low throughput of the communication canal in the presented solution already enables transmission and visualisation of huge geometric data sets in real time.


2511-01-310004 A model for offering data for Surveying Authority of Republic Slovenia and a plan for its implementation

Leader: Assoc. Prof. Dr. Borut Žalik Participants: David Podgorelec, MSc; Matej Gomboši; Sebastian Krivograd Project partners: IGEA d.o.o., Aster d.o.o., Slovenia

Financed by: Surveying and Mapping Authority of the Republic of Slovenia Duration: October 2001 to December 2001

In the project, parameters affecting electronic offering of data of Surveying and Mapping Authority of the Republic of Slovenia are analysed in detail first. Analysis considers spatial data and their use. After this, the model of system is proposed. In co-operation with other government institutions, this system will enable complete offering of the spatial data of Surveying and Mapping Authority of the Republic of Slovenia. We also propose organisation and team structure necessary to realise the system. At the end, we analyse particular steps of the system realisation. These steps are evaluated according to priority, time and price.


Industrial project

Difference termination between two sets of topologically congruent polygons

Leader: Assoc. Prof. Dr. Borut Žalik Participants: Matej Gomboši

Financed by: IGEA d.o.o., Slovenia Duration: November 2000 to May 2001

The goal of this project was the automation of control and evidence changes in a digital land register. The data in land registers needs to be frequently updated because some parcels of land could be sold or divided up between several inheritors, or simply because of a previous wrong input. Parcels are represented by a set of polygons. Changes are analysed inside a selected area. It can be small consisting of some ten parcels, or the whole city containing thousands of parcels. Newly measured parcels should be compared by an existing version in a land register. We have developed a new comparison algorithm, which successfully detects and analyses various changes. This program enables evidence of the changes besides updating the land register. In this way, a change can be tracked through a selected time period. The application is implemented in MS Visual C++ in Windows environment. The data are stored in Dbase3 files.

Example of the input set of polygons: the town of Piran.



Alg Vis Algorithms for Computer Graphics, Computational Geometry and Visualisation in Parallel and Distributed Processing

Co-ordinators: Assoc. Prof. Dr. Borut Žalik, Prof. Dr. Václav Skala Participants: Prof. Dr. Nikola Guid; Simon Kolmanič, MSc; David Podgorelec,

MSc; Damjan Strnad, MSc; Matej Gomboši; Sebastian Krivograd Project partner: University of West Bohemia, Plzen, Czech Republic

Financed by: Ministry of Science and Technology of the Republic of Slovenia, Government of Czech Republic

Duration: April 1999 to March 2001

The main goals of the joint work were: to set up international bilateral co-operation in the field of computational geometry, computer graphics and data visualisation algorithms, especially in the Internet environment, to present results of the common research at international conferences, workshops and in recognised scientific journals, to develop new algorithms in the fields referred by the project, and to prepare common international project proposals.

PUBLICATIONS

Borut Žalik, “Merging a set of polygons,” Comput. graph., No. 25, pp. 77-88, 2001.

Borut Žalik, Ivana Kolingerova, “A cell-based point-in-polygon algorithm suitable for large sets of points,” Comput. geosci., Vol. 27, pp. 1135-1145, 2001.

Sebastian Krivograd, Borut Žalik, Matej Gomboši, “Polygon reconstruction from set of line segments,” Contrib. geom. model. multimed., Vol. 1, No. 7, pp. 1-22, 2001.

Sebastian Krivograd, Borut Žalik, David Podgorelec, Matej Gomboši, Gregor Klajnšek, Mirjan Hajnc, “Java polygon editor,” Contrib. geom. model. multimed., Vol. 1, No. 3, pp. 1-20, 2001.

David Podgorelec, Borut Žalik, “A triangulation algorithm for concave polygons containing holes,” Contrib. geom. model. multimed., Vol. 1, No. 1, pp. 1-28, 2001.

Borut Žalik, Ivana Kolingerova, “An incremental construction algorithm for Delaunay triangulation based on two-level uniform subdivision,” Contrib. geom. model. multimed., Vol. 1, No. 5, pp. 1-32, 2001.

Borut Žalik, Sebastian Krivograd, “Point-in-Polygon test based on a uniform space subdivision,” Contrib. geom. model. multimed., Vol. 1, No. 4, pp. 1-28, 2001.


Borut Žalik, David Podgorelec, Matej Gomboši, Sebastian Krivograd, “An incremental radomized approach to the envelope determination of a huge set of topologically consistent polygons,” Contrib. geom. model. multimed., Vol. 1, No. 2, pp. 1-28, 2001.

Borut Žalik, Mirko Zadravec, Gordon J. Clapworthy, “Constructing geometric outlines for line segments,” Contrib. geom. model. multimed., Vol. 1, No. 6, pp. 1-26, 2001.

Branko Kaučič, Borut Žalik, “Quasi-regular tessellation of hexagons,” CIT. J. Comput. Inf. Technol., Vol. 9, No. 3, pp. 227-232, Sept. 2001.

Borut Žalik, “Ozemljena GP antena za 7 MHz in 10 MHz,” CQ ZRS, Vol. 12, No. 1, pp. 32-34, Feb. 2001.

Borut Žalik, David Podgorelec, “Geografski informacijski sistemi - integrativna informacijska paradigma,” Geod. vestn., pp. 320-326.

Sebastian Krivograd, Borut Žalik, “Prikaz velikih količin geometrijskih podatkov preko interneta,” Geod. vestn., pp. 327-333.

Branko Kaučič, Borut Žalik, “Izbira primerne metode računanja vidnosti na digitalnem modelu reliefa,” Geod. vestn., pp. 334-340.

Branko Kaučič, Borut Žalik, “COMB GRID - another approach for real-time terrain flythroughs,” 9th annual conference GISRUK 2001, Glamorgan, Great Britain, April 2001, pp. 212-217.

David Podgorelec, Borut Žalik, “A geometric constraint solver with decomposable constraint set,” 9th international conference in Central Europe on computer graphics, visualisation and computer vision WSCG 2001, in co-operation with Eurographics and IFIP WG.5.10, Plzen, Czech Republic, Feb. 2001, Vol. 2, pp. 222-229.

Matej Gomboši, “Evolution of path finding,” 23rd international conference on information technology interfaces ITI 2001, Pula, Croatia, June 2001, pp. 133-138.

Sebastian Krivograd, Metod �karja, Borut Žalik, David Podgorelec, “Low cost energy analyser of beings,” 23rd international conference on information technology interfaces ITI 2001, Pula, Croatia, June 2001, pp. 267-272.

Branko Kaučič, Borut Žalik, “Quasi-regular tessellation of hexagons,” 23rd international conference on information technology interfaces ITI 2001, Pula, Croatia, June 2001, pp. 403-408.


Matej Gomboši, “Vsebnostni test za mnogokotnike s krožnimi loki,” The 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 231-234.

David Podgorelec, Marko Vinter, Borut Žalik, “Metode vizualizacije volumskih medicinskih podatkov na osebnem račulnalniku,” Seminar Informatika v zdravstvu, Ljubljana, Slovenia, Oct. 2001, pp. 1-3.


David Podgorelec, Marko Vinter, Borut Žalik, “Metode vizualizacije volumskih medicinskih podatkov na osebnem računalniku,” a talk at the seminar entitled Informatika v zdravstvu, within INFOS '01, Ljubljana, Slovenia, Oct. 25, 2001.

Borut Žalik, “Contributions to geometric modelling at Faculty of EE&CS of University of Maribor,” invited lecture at the Konversatorium course, University of Technology, Graz, Austria, Nov. 2001.


Matej Gomboši, Sebastian Krivograd:

Research work in the Alg Vis project, University of West Bohemia, Plzen, Czech Republic, May 13–19, 2001.

Assoc. Prof. Dr. Borut Žalik: Invitided lecture Contributions to geometric modelling at Faculty of EE&CS of University of Maribor and restoring the co-operation, Graz University of Technology, Graz, Austria, Nov. 2001.

GUESTS AND VISITORS

Martin Franc, Michal Rousal (University of West Bohemia, Plzen, Czech Republic):

Research work in the Alg Vis project, May 20–27, 2001.

Asst. Prof. Dr. Ivana Kolingerova (University of West Bohemia, Plzen, Czech Republic):

Research work in the Alg Vis project, June 3–10, 2001.

Institute of Informatics IN – 1

INSTITUTE OF INFORMATICS

Head:

Prof. Dr. Ivan Rozman

Phone: +386 2 235 51 00


URL: http://www.in.feri.uni-mb.si/

Students of the informatics sciences programs acquire a knowledge of information systems’ development, algorithm analysis and design, data structures, database design, software engineering, object technology and component based development, intelligent systems design, and software quality management. Graduates then pursue careers in the fields of software engineering, design and maintenance of information systems, intelligent systems, and databases.

Members of the Institute conduct research in the fields of software engineering with special focus on object-oriented methods and tools, information systems design, intelligent systems supporting system engineering activities, expert systems design, database design, and design and implementation of software quality management methodologies.

IN – 2 Institute of Informatics

The educational and research activities of the Institute are divided into four laboratories.

Information Systems Laboratory

Head: Prof. Dr. Ivan Rozman

Employees: Asst. Prof. Dr. Marjan Heričko; Assoc. Prof. Dr. Bojan Novak; Davor Bonačić, MSc; Asst. Prof. Dr. Romana Vajde Horvat; Asst. Prof. Dr. Branko Matjaž Jurič; Dr. Vili Podgorelec; Aleš Živkovič, MSc; Simon Beloglavec, BSc; Tomaž Domajnko, BSc;

Information System

Laboratory Head:


Database Technologies

Laboratory Head:

Assoc. Prof. Dr. Tatjana Welzer Družovec

Computer Mediated Communication

Laboratory Head:

Assoc. Prof. Dr. József Györkös

Real-Time Systems

Laboratory Head:

Assoc. Prof. Dr. Matjaž Colnarič

Institute of Informatics Head:


Institute of Informatics IN – 3

Tomislav Rozman, BSc; Katja Harej, BSc; Gregor Polančič, BSc; Miha Strehar; Boštjan Šumak; Igor Novak

Database Technology Laboratory

Head: Assoc. Prof. Dr. Tatjana Welzer Družovec

Employees: Boštjan Brumen, BSc; Izidor Golob, BSc; Štefan Masič, Ing.; Matjaž Planinšič

Real-Time Systems Laboratory

Head: Assoc. Prof. Dr. Matjaž Colnarič

Employees: Asst. Prof. Dr. Domen Verber; Dr. Roman Gumzej; Stanislav Moraus, BSc; Bojan Ploj, BSc

Computer Mediated Communication Laboratory

Head: Assoc. Prof. Dr. József Györkös

Employees: Robert Leskovar, BSc; Boris Lahovnik, BSc; Andrej Bregar, BSc; Goran Papić, BSc

IN – 4 Information Systems Laboratory

INFORMATION SYSTEMS LABORATORY

Head:


Phone: +386 2 235 51 00


RESEARCH PROJECTS


Applied project

L2-0841-0796-98 Adaptivno modeliranje programskih procesov in njihova implementacija (Adaptive Modelling and Implementation of Software Process)

Leader: Prof. Dr. Ivan Rozman Participants: Assoc. Prof. Dr. József Györkös; Prof. Emeritus Dr. Bruno Stiglic;

Assoc. Prof. Dr. Tatjana Welzer Družovec; Asst. Prof. Dr. Marjan Heričko; Asst. Prof. Dr. Domen Verber; Asst. Prof. Dr. Branko Marjaž Jurič; Asst. Prof. Dr. Romana Vajde Horvat; Davor Bonačič, MSc; Simon Beloglavec; Dr. Tomaž Domajnko; Boris Lahovnik; Robert Leskovar; Marko Klemenčič; Rado Jensterle; Ljiljana Pretnar; Miha Strehar

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, RRC - Računalniške storitve, Zavarovalnica Maribor, GENIS d.o.o., Slovenian Government Centre for Informatics

The goal of this research project is the development of a methodology for the formal definition and continuous improvement of the software process. This developed methodology, together with the knowledge and experience gained in quality systems establishment, will be used for the development of an integral environment, which will support software process implementation. Together with the development of an integrated tool, we also study the usage of modern object-oriented tools and techniques, object databases, and distributed processing.

Information Systems Laboratory IN – 5


Metodologija enotnega vzpostavljanja sistemov vodenja kaovosti v informacijski družbi (Methodology for Unified Quality Management System Establishment in Information Society)

Participants: Assist. Prof. Dr. Romana Vajde Horvat, Prof.Dr. Ivan Rozman, Katja Harej, Tomislav Rozman, Gregor Polančič, Boštjan Brumen, Boris Lahovnik, Davor Bonačić

Financed by: Ministry of Education, Science and Sports of Republic of Slovenia and Ministry of Information Society of Republic of Slovenia

This project is financed within the Slovenian program “Competitive position of Slovenia in 2001-2006”.

Goals of the project are: • development of methodology for process description and description of their

relationships in a notation which will be suitable for any organization in information society

• development of methodology for establishment of Quality Management System within any organization in information society

• verification of developed methodology in specific organization (governmental organization), and

• dissemination of the methodology (within governmental organizations and broader).

Industrial projects

Tehnološka prenova sistema COBISS (Technological Reengineering of COBISS System)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Marjan Heričko; Assoc. Prof. Dr. József Györkös; Asst. Prof. Dr. Branko Matjaž Jurič; Asst. Prof. Dr. Romana Vajde Horvat; Aleš Živkovič, MSc; Simon Beloglavec; Miha Strehar; Boštjan Šumak; Igor Novak

Financed by: IZUM, Maribor, Slovenia

Institute of Informatics is organizing education and qualifications for development teams from IZUM. The goal of these activities is to widen their knowledge of object technology. In the project, the contents related to information system development in Java, distributed object architectures, unified modelling language UML, and object process models, are treated. The


other important goal of collaboration is definition of standard procedures for object development, with emphasis on reuse on higher levels of abstraction. Related to this, patterns for software development are introduced.

Prehod na objektno tehnologijo (NKBM) (Transition to Object Technology)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Marjan Heričko; Asst. Prof. Dr. Branko Matjaž Jurič; Aleš Živkovič, MSc; Simon Beloglavec; Miha Strehar; Boštjan Šumak

Financed by: Nova KBM, Maribor, Slovenia

The Object Technology Center assists the technological evaluation of pilot projects for the component-based development of Web object applications using object modelling (UML), distributed objects, CORBA, Java, JavaBeans and Enterprise JavaBeans, object-relational database management systems, object transaction monitors, and networked computers. In addition, special attention is paid to establishing a defined and systematic object-oriented software development process.

Šola informatike (Slovenian Information Technology School)

Participants: Prof. Dr. Ivan Rozman; Assoc. Prof. Dr. József Györkös; Asst. Prof. Dr. Marjan Heričko; Asst. Prof. Dr. Branko Matjaž Jurič; Asst. Prof. Dr. Romana Vajde Horvat; Aleš Živkovič, MSc; Irena Žerko - SRC d.o.o.

Financed by: SRC d.o.o., Maribor, Slovenia

The SRC d.d. Company established the Slovenian Information Technology School (SITS) in 1997, the aim of which is to educate about information technology related issues. The Laboratory of Information Systems cooperates with this school in two subjects “Quality in Information Technology” and “Object Technology”. Seminars and workshops are held within SITS. SRC d.d. organizes activities and the Laboratory of Information Systems is responsible for the content of the educational activities.

Posredovanje znanja o objektni tehnologiji in komponentnem razvoju (Knowledge Dissemination on Object Technology and Component Based Development)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Marjan Heričko; Asst. Prof. Dr. Branko Matjaž Jurič; Aleš Živkovič, MSc; Simon Beloglavec; Miha Strehar; Boštjan Šumak; Igor Novak

Financed by: Infonet Kranj d.o.o., Slovenia

The aim of this project is collaboration in education and knowledge dissemination in object


technology and component based development. The performer will define a strategy for the transition to object technology and a component based process model. He will develop pilot applications to support the strategy. The knowledge transfer will take place in the form of workshops.

Zagotovitev uspešne uporabe objektne tehnologije in komponentnega razvoja (Ensuring Successful Usage of Object Technology and Component Development)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Marjan Heričko; Asst. Prof. Dr. Branko Matjaž Jurič; Aleš Živkovič, MSc; Simon Beloglavec; Miha Strehar; Boštjan Šumak; Igor Novak

Financed by: RRC Računalniške storitve d.d., Slovenia

The goals of collaboration are connected with the successful usage of object technology and component development in the following priority areas: the development of modern, web-based applications, component model deployment and legacy systems integration, and successful management of reuse. The performer will deliver seminars and workshops, thematically connected with object technology, component development, object modelling, UML, object development process, distributed objects, component models, Java, XML, security, m-commerce, and WAP, object-relational databases, SQL, and reuse through patterns.

Vpeljava objektne tehnologije in komponentnega razvoja (Object Technology and Component Development Initiation)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Marjan Heričko; Asst. Prof. Dr. Branko Matjaž Jurič; Aleš Živkovič, MSc; Simon Beloglavec; Miha Strehar; Boštjan Šumak

Financed by: Razvojni center IRC Celje d.o.o., Slovenia

The goals of our collaboration are the initiation of object technology and component development in Razvojni center IRC Celje d.o.o. and the corresponding education process. The performer will develop custom based seminar workshops, in the following topics: introduction to object technology and component development, introduction to Java, object modelling with UML, object development process, component models and distributed objects CORBA.

Izvedba analize zahtev za podatkovno bazo SIST (Requirements analysis for SIST database)

Participants: Prof. Dr. Ivan Rozman, Asst. Prof. Dr. Romana Vajde Horvat, Gregor Polančič, Tomislav Rozman, Katja Harej, Assoc. Prof. Dr. Tatjana Welzer Družovec, Štefan Masič


Financed by: Slovenian Institute for Standardization

The two main goals of the project are: • requirements analysis for an information system which would support the

standardization processes of SIST, and • review of the applicability of different DBMS according to the specifics of

standardization processes.

The project will be conducted in following phases: Phase 1: Analysis of standardization processes within SIST, based on a review of the current state and use of the information technology support. Phase 2: The development of a conceptual model of SIST database and description of required functionality of the information system to support standardization processes. Phase 3: Analysis of the applicability of commercial DBMS (Oracle and LotusNotes environment).

Results of the project will be: conceptual model of SIST database and report of the DBMS analysis.


TEAMWORK IST-2000-28162

Technology Exploitation and Adaptable Methodologies offering new Organisational Models and Practices for e-Working Teams

Participants: Prof. Dr. Ivan Rozman, Asst. Prof. Dr. Romana Vajde Horvat, Assoc. Prof. Dr. Tatjana Welzer Družovec, Gregor Polančič, Tomislav Rozman, Regina Stajnko, Boštjan Brumen, Katja Harej

Financed by: European Union, 5th Framework Project

The main goal of the project is to verify and disseminate the BestregIT methodology (developed within previous EU projects and aims to model the organization’s mission, structure and process workflow) and NQA environment (which enables the automatization of workflow and document management). Both, BestregIT and NQA, have been introduced to members of the project team. Within the second part of the project, University of Maribor team modelled the Socrates Erasmus student exchange process. Further, the model will be supported within NQA and verified and used within a test group of users. Other process models for cooperation of different partners within EU projects and for the cooperation of research institutions will be developed, as well as model for software development support. The results of the project will be disseminated within the broader community. There are 14 partners working within the project. The budget of the project is 1.2 million euro.


Sistemi integracije inteligence v zdravstveno okolje (Intelligent Systems Integration in Medical Environment)

Leaders: Assoc. Prof. Dr. Tatjana Welzer Družovec, Prof. Dr. Lorenzo Moreno Ruiz

Participants: Assoc. Prof. Dr. Peter Kokol, Asst. Prof. Dr. Marjan Družovec, Prof. Emeritus Dr. Bruno Stiglic, Boštjan Brumen, Dr. Špela Hleb Babič, Asst. Prof. Dr. Milan Zorman, Dr. Vili Podgorelec

Partner: Centro Superior de Informatica Universidad de La Laguna – Tenerife

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, Ministry of Foreign Affairs of the Kingdom of Spain

In the scope of the project as a first part a simulation of the hospital management will be performed together with our partners. A database, containing all necessary data about administration, hospital resources, schedules, personnel, etc. will serve as a basis for the program. The second part of the project represents a classification system for patients with Alzheimer disease, based on the EEG signals. The analysis will be performed by symbolical representation of EEG signals with fuzzy automata, statistical classification and neural networks.

HEMIS-J Heterogeni medicinski inteligentni sistemi (Heterogeneous Medical Intelligent Systems)

Leaders: Assoc. Prof. Dr. Peter Kokol, Prof. Dr. Ryuichi Yamamoto Participants: Asst. Prof. Dr. Milan Zorman; Dr. Vili Podgorelec; Mitja Lenič, MSc;

Matej Šprogar Partner: Osaka Medical College, Department of Medical Informatics, Osaka,

Japan


An important problem with the analysis of medical data lies in the fact that data is very dispersed throughout various departments, institutions, and even countries; on different types of computers and operating systems, etc. Therefore, in the scope of the project use of heterogeneous processing over world wide web is explored. An additional advantage of the heterogeneous approach is the increased computational power that helps a lot in the case of complex intelligent analyses.



Applied projects

L2-1641-99 Mehko krmiljenje varjenja v zaščitni atmosferi (Fuzzy Welding Control MIG/MAG)

Leader: Assoc. Prof. Dr. Bojan Novak Participants: Dr. Marjan Golob; Dr. Nenad Muškinja; Assoc. Prof. Dr. Boris

Tovornik; Aleksander Bon; Prof. Dr. Janez Tušek; Miro Uran, MSc; Dr. Arpad Koveš; Danilo Krapec; Janoš Orban; Aleš Puklavec

Financed by: Ministry of Science and Technology of the Republic of Slovenia, Varostroj, Slovenia

Duration: 1999 – 2001

The problem of implementing an efficient regulation for the fuzzy welding procedure MIG/MAG that is economically successful, is the definition for a suitable mathematical model, because of the problem complexity and achievement of real-time hardware timings. In this project a process model for electrical arch controlling has been developed using fuzzy logic in welding procedure MIG/MAG. The model incorporates linguistic variables, based on welder experience. The welding process is represented using inverse fuzzy model and differential equations. The dependency relationship of stream, block length and distance are shown. The consistency between the model and real-world results has been proved by laboratory measurements. The main advantage of fuzzy current regulation compared to linear regulation is the user-friendly design of the non-linear properties. Using these, we can achieve optimal quality of regulation. Fuzzy regulation also enables us to integrate new extensions such as electricity power, material type, gas type, etc.

KALIMO Konceptualni miselni vzorci (Conceptual networks)

Participants: Assoc. Prof. Dr. Peter Kokol, Dr. Vili Podgorelec

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia Duration: 2001

Conceptual network is an upgrade of the usual semantic networks which are used frequently and successfully in educational processes. In the framework of the project a software package has been developed for constructing, editing and using the conceptual networks. With the help of the tool students and scholars are able to improve their learning capabilities, leading to better study results and more comprehensive understanding of study materials.


Industrial projects

Novi standardi ISO 9000:2000 v Sloveniji (New Standards ISO 9000:2000 in Slovenia)

Participants: Asst. Prof. Dr. Romana Vajde Horvat; Prof. Dr. Ivan Rozman; Vesna Lešnik, MSc; Tomi Rozman

Financed by: CCIS, participants of seminars/workshops Duration: 1999 – 2001

Within this project, several seminars and workshops on ISO 9000:2000 topics were conducted in cooperation with the Metrology and Standardization Institute of Slovenia and the Chamber of Commerce and Industry of Slovenia. The content of the seminars and workshops discussed the international and local development of new family ISO 9000:2000 standards. Requirements for new standards were also presented in detail. As the second goal of the project, the validation of new standards was conducted in some Slovenian companies.

Izgradnje informacijskih sistemov v državnih organih CVI-FERI-EMRIS (Information Systems Development in State Agencies)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Marjan Heričko; Assoc. Prof. Dr. József Györkös; Asst. Prof. Dr. Branko Matjaž Jurič; Asst. Prof. Dr. Romana Vajde Horvat; Tomaž Domajnko; Aleš Živkovič, MSc; Boris Lahovnik; Simon Beloglavec; Robert Leskovar; Miha Strehar; Boštjan Šumak; Igor Novak

Financed by: Center Vlade RS za informatiko (CVI), Slovenia Duration: 2000 – 2001

The goal of the project was advising on, and the development of a unified method for object based information system development with the emphasis on modern accessions, cooperation by the development of other volumes of the unified methodology, and the development of an assessment method for the determination of the size and the cost of software projects.

Metodologija razvoja in vzdrževanja informacijskih sistemov – objektni pristop (MRIS-OP) (Information Systems Development and Maintenance Methodology – Object Accession)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Marjan Heričko; Asst. Prof. Dr. Branko Matjaž Jurič; Asst. Prof. Dr. Romana Vajde Horvat; Tomaž Domajnko; Aleš Živkovič, MSc; Simon Beloglavec; Miha Strehar; Boštjan Šumak; Igor Novak


Financed by: Telekom Slovenije, d.d. Duration: 2000 – 2001

Within this project, the software development process and the maintenance process have to be re-engineered. Knowledge dissemination has taken place and a methodology framework for software development and for information services has been defined. Quality assurance and cooperation by the quality reviews has been provided. The activities of the MRIS-OP project include the definition and initiation of an object development cycle used in development and maintenance. We developed a custom methodology and delivered it in document form. The methodology will serve as the initialisation, coordination, management and supervision of software projects.

Vzpostavitev sistema kakovosti za področje informatike s standardnimi postopki (Quality Assurance System for Informatics with Standard Procedures)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Romana Vajde Horvat; Asst. Prof. Dr. Marjan Heričko; Vesna Lešnik, MSc; Tomi Rozman; Gregor Polančič; Katja Harej


This project was aimed to define and re-engineer the software development process in the Information technology sector of Telekom Slovenia. Seminars and workshops for software process improvement areas were conducted within the project. Representatives of Telekom were trained to conduct the SPI and quality management system activities within their Sector of information technology. The contents of 20 processes were defined. The project was conducted according to PROCESSUS® methodology, which was developed by the Laboratory of information technology.


SLO-US 015 Inteligentni sistemi na osnovi mehkega računanja (Intelligent Systems Based on Fuzzy Computing)

Leader: Assoc. Prof. Dr. Bojan Novak Participants: Prof. Dr. Lotfi A. Zadeh, UC Berkeley, USA

Financed by: Ministry of Science and Technology for the Republic of Slovenia Duration: 1999 – 2001

Artificial neural networks (ANNs) can be merged with fuzzy logic to automatically generate membership functions, rules and inference systems. Three basic implementations are:


neural-based fuzzy systems, fuzzy-based neural networks and fuzzy-neural hybrid systems. In this third approach, the best properties from both techniques are used. To this category belong adaptive controllers such as the FALCON (Fuzzy Adaptive Learning Control Network) and the ANFIS (Adaptive Neural Fuzzy Inference System). They are implemented in the form of a radial basis function network (RBFN). Unfortunately these tools are complicated and can generate very complicated error surfaces with multiple local optimums that are traps for the learning algorithm. If the structure of the ANN (the number of neurons in the hidden layer) is improperly defined, the actual error will remain high despite a low training error, i.e., over-fitting. These troubles can be avoided through the selection of adequate input variables and proper ANN structure. Different time-consuming methods exist to define optimal structure such as pruning, optimal brain damage etc. The problem, however, of complicated error surfaces with multiple error surfaces still remains. Automatic rule generation and optimal shape of membership functions can be generated with the addition of clustering methods, Basically the idea of clustering is to generate new vectors - cluster centres in the centre of the areas where a cluster of data exists. The cluster centres are the basis for a decision about the rule generation. Another important fact is that in practical applications, very limited sources of the data are available for learning. An ANN is capable of learning on a data set, which is large enough. Different validation techniques exist to construct the ANN with a minimal actual error. These methods must extract a significant amount of data into the validation set, so the training set becomes even smaller which significantly affects the quality of the ANN performance. In this research a different approach is considered. Instead of generating cluster centres, some vectors are chosen by using certain described criteria. The structure of the learning machine is defined during training. The Vapnik Chervonenkis (VC) dimension is introduced as a measure of the capacity of the learning machine. A prediction of the expected error on the yet, unseen examples can be estimated with the help of the VC dimension. The structural risk minimization principle is introduced to construct a machine with the lowest expected error. Validation step is unnecessary since a reliable formulation of the upper bound on the actual error is formulated based on the VC dimension. This is particularly important when the data set is small. The problem is transformed into the reproducing kernel Hilbert space that is a very efficient method of transforming a non-linear problem to the linear. Advantages over other fuzzy-neural hybrid systems are: The architecture of the system doesn't have to be determined before training. Solution of the optimisation problem is unique, whereas conventional ANNs have multiple local minimum error positions.

INMES Intelligent Medical Systems

Co-ordinators: Assoc. Prof. Dr. Peter Kokol, Prof. Dr. Lenka Lhotska Participants: Assoc. Prof. Dr. Tatjana Welzer Družovec, Asst. Prof. Dr. Milan

Zorman, Dr. Vili Podgorelec, Dr. Špela Hleb Babič, Matej Šprogar Project partners: Czech Technical University of Prague



In order to design successful intelligent systems to be used in medical applications, we designed them with an appropriate design methodology. Therein lies another weakness – very few, if any, such methods exist in the world. Therefore the goals of our research were to develop successful design methods, to use these methods in designing real-world intelligent medical systems that are also based on hybrid approaches, and to use these systems in a manner that “invents” new medical knowledge in selected medical fields.

PUBLICATIONS

Branko-Matjaž Jurič, Ivan Rozman, “RMI, RMI-IIOP, and IDL perfomance comparison: performance of distributed object models,” Java rep., Vol. 6, No. 4, pp. 26-34, Apr. 2001.


Tatjana Welzer Družovec, Ivan Rozman, Marjan Družovec, Romana Vajde Horvat, Iztok Takač, Boštjan Brumen, “Database reusability in intelligent medical systems,” J. med. syst., Vol. 25, No. 2, pp. 83-93, 2001.

Vili Podgorelec, Peter Kokol, “Towards more optimal medical diagnosing with evolutionary algorithms,” J. med. syst., Vol. 25, No. 3, pp. 195-219, 2001.

Bojan Novak, “An efficient method for selecting the optimal structure of a fuzzy neural network architecture,” J. Comput. Inf. Technol., Vol. 9, No. 2, pp. 113-122, 2001.

Bojan Novak, “Soft computing on small data sets,” Informatica, Vol. 25, No. 1, pp. 83-88, Apr. 2001.

Romana Vajde Horvat, Tatjana Welzer Družovec, Ivan Rozman, Mirko Soković, “Ocenjevanje zahtevnosti postopkov,” Stroj. vestn., Vol. 47, No. 1, pp. 15-27, 2001.

Boštjan Brumen, Tatjana Welzer Družovec, Romana Vajde-Horvat, Ivan Rozman, “Varovanje podatkov v računalniških sistemih,” Kakovost, No. 3, pp. 20-23, 2001.

Branko-Matjaž Jurič, “Komponente za vmesni sloj,” Sistem, pp. 45-46, May 2001.

Branko-Matjaž Jurič, “Ogrodje Microsoft.NET,” Monitor, Vol. 11, No. 2, pp. 134-137, 2001.

Branko-Matjaž Jurič, “Učinkovitost komponent za vmesno plast,” Monitor, Vol. 11, No. 4, pp. 138-142, 2001.


Branko-Matjaž Jurič, “EJB performance and scalability,” Professional EJB, Birmingham, Great Britain: Wrox 2001, pp. 656-713.

Vili Podgorelec, Peter Kokol, “Evolutionary decision forests - decision making with multiple evolutionary constructed decision trees,” Problems in applied mathematics and computational intelligence (Mathematics and computers in science and engineering), pp. 97-103.

Katja Harej, “Afera Telekom - Arnes,” kolokvij Komuniciranje v informacijski družbi, Vol. 2, Država in posameznik v informacijski družbi, Maribor, Slovenia 2001, pp. 18-26.

Marin Silič, Marko Colnar, Marjan Krisper, József Györkös, Marko Ambrož, Aleksander Bucik, Aleš Dobnikar, Boris Butina, Aleksander Boh, Nika Rebernik, Marko Črnigoj, Tatjana Hajtnik, Ivan Bohanec, Saša Bole, Pavla Lah, Dušan Šalehar, Barbara Wohinz, Ivan Rozman, Vladislav Rajkovič, Janez Bešter, Franc Solina, Blaž Zupan, Aleksander Novaković (ed.), Roman Tomažič (ed.), E-poslovanje v javni upravi RS za obdobje od leta 2001 do leta 2004. Ljubljana, Slovenia: Center Vlade za informatiko 2001.

Peter Kokol, Špela Hleb Babič, Vili Podgorelec, Milan Zorman, Inteligentni sistemi. Maribor, Slovenia: Faculty of Electrical Engineering and Computer Science 2001.

Marin Silič, Marko Colnar, Marjan Krisper, Rok Rupnik, Marko Bajec, Ivan Rozman, Marjan Heričko, Tomaž Domajnko, Branko-Matjaž Jurič, Aleš Živkovič, Simon Beloglavec, Mitja Kožman, Aleksander Novaković, Mitja Stantič, Samo Rubin, Roman Tomažič, Rado Jensterle, Enotna metodologija razvoja informacijskih sistemov. Vol. 5, Razvoj IS za upravljanje delovnih procesov. Ljubljana, Slovenia: Vlada Republike Slovenije, Center za informatiko 2001.

Tatjana Welzer Družovec, Boštjan Brumen, Izidor Golob, Ivan Rozman, “Data mining - an overview,” International ICSC congress on Computational intelligence CIMA 2001, Bangor, Great Britain, 5 pp.

Vili Podgorelec, Peter Kokol, Ryuichi Yamamoto, Gou Masuda, Norihiro Sakamoto, “Knowledge discovery with genetically induced decision trees,” International ICSC congress on Computational intelligenc CIMA 2001, Bangor, Great Britain, June 2001, 7 pp.

Vili Podgorelec, Peter Kokol, Milan Zorman, Matej Šprogar, M. Pighin, “The operative constraints of software reliability prediction methods,” World Multiconference on Systemics, Cybernetics and Informatics SCI 2001 and ISIS 2001, Orlando, USA, July 2001, Vol. 11, pp. 229-234.

Marko Bajec, Marjan Krisper, Ivan Rozman, Ivan Vezočnik, “Business rule in a business model,” Business information technology management, Kairo, Egypt, June 2001, pp. 1-12.


Marjan Heričko, Simon Beloglavec, Branko-Matjaž Jurič, Aleš Živkovič, “Development of business objects for fabric production,” The IASTED International Symposia Applied Informatics, Innsbruck, Austria, Feb. 2001, pp. 676-679.


Vili Podgorelec, Peter Kokol, “Evolutionary decision forests - decision making with multiple evolutionary constructed decision trees,” The WSES international conferences Neural network and applications NNA 2001, Fuzzy sets and fuzzy systems FSFS 2001, Evolutionary computation EC 2001, Puerto De La Cruz, Spain, Feb. 2001, 7 pp.

Vili Podgorelec, Milan Zorman, Peter Kokol, H.-P. Eich, C. Ohmann, “Cross-learning on multiple databases in the case of acute appendicitis,” 14th IEEE symposium on computer-based medical systems CBMS 2001, Bethesda, USA, July 2001, pp. 17-22.


Matej Šprogar, Peter Kokol, Milan Zorman, Vili Podgorelec, Lenka Lhotska, Jiøi Klema, “Notes on medical decision model creation,” Second international symposium ISMDA 2001, Madrid, Spain, Oct. 2001, pp. 270-275.

Matej Šprogar, Peter Kokol, Milan Zorman, Vili Podgorelec, Ryuichi Yamamoto, Gou Masuda, Nrihiro Sakamoto, “Supporting medical decision with vector decision trees,” 10th World Congress on Medical Informatics MEDINFO 2001, London, Great Britain, 2001, 5 pp.

Matjaž B. Jurič, Ivan Rozman, Marjan Heričko, Tatjana Welzer-Družovec, Jozsef Gyorkos, “Distributed objects performance optimization and modeling,” Information systems technology and its application ISTA 2001, Kharkiv, Ukraine, June 2001, pp. 65-75.

Vili Podgorelec, Peter Kokol, “Oblikovanje inteligentnih sistemov in odkrivanje znanja z avtomatskim programiranjem,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 169-172.

Branko-Matjaž Jurič, “Microsoftove komponente za vmesni sloj in primerjava s konkurenco,” 6. NT konferenca, Portorož, Slovenia, May 2001, pp. 13.

Igor Novak, Simon Beloglavec, Marjan Heričko, “Vloga sporočilnih sistemov in JMS pri integraciji sistemov,” Dnevi slovenske informatike, Portorož, Slovenia, Apr. 2001, pp. 74-81.


Simon Beloglavec, Boris Benko, Ivan Rozman, “Arhitekturne rešitve za spletne informacijske sisteme na osnovi Jave,” Dnevi slovenske informatike, Portorož, Slovenia, Apr. 2001, pp. 82-90.

Tomislav Rozman, Romana Vajde Horvat, Ivan Rozman, Gregor Polančič, “Razvoj in funkcije orodja za modeliranje in ocenjevanje kompleksnosti procesov (SOPCOM-TOOL),” Dnevi slovenske informatike, Portorož, Slovenia, Apr. 2001, pp. 152-159.

Katja Harej, Romana Vajde Horvat, Ivan Rozman, “Pomoč uporabnikom - razvoj centra za pomoč uporabnikom infomacijskih tehnologij,” Dnevi slovenske informatike, Portorož, Slovenia, Apr. 2001, pp. 175-183.

Gregor Polančič, Romana Vajde Horvat, Ivan Rozman, Tomislav Rozman, “Gradnja spletne aplikacije za upravljanje dokumentacije sistema vodenja kakovosti,” Dnevi slovenske informatike, Portorož, Slovenia, Apr. 2001, pp. 279.

Bojan Novak, “Parallel computation in operational research,” 6th International Symposium on Operational Research in Slovenia SOR '01, Preddvor, Slovenia, Sept. 2001, pp. 77-82.

Vili Podgorelec, Peter Kokol, Andrej Kunej, “Maintenance scheduling in nuclear power plant using genetic algorithms,” 6th International Symposium on Operational Research in Slovenia SOR '01, Preddvor, Slovenia, Sept. 2001, pp. 163-168.

Peter Kokol, Vili Podgorelec, Ryuichi Yamamoto, Gou Masuda, Norihiro Sakamoto, “Medical knowledge extraction via hybrid decision trees,” 11th European-Japanese Conference on Information Modelling and Knowledge Bases, Maribor, Slovenia, May 2001, pp. 378-385.

Marjan Golob, Arpad Köveš, Aleš Puklavec, Boris Tovornik, Bojan Novak, “Modeliranje, simulacija in mehko vodenje varilnih postopkov GMAW,” druga konferenca Avtomatizacija v industriji in gospodarstvu, Maribor, Slovenia, Apr. 2001, pp. 52-59.

Aleš Živkovič, “Kaj potrebuje razvijalec sodobnih sistemov na svojem namizju?” Objektna tehnologija v Sloveniji OTS 2001, Maribor, Slovenia, June 2001, pp. 12-21.

Matjaž B. Jurič, “Primerjava ogrodja .NET in platforme Java 2 EE,” Objektna tehnologija v Sloveniji OTS 2001, Maribor, Slovenia, June 2001, pp. 40-48.

Simon Beloglavec, “Optimizacijske metode poslovnih Java aplikacij,” Objektna tehnologija v Sloveniji OTS 2001, Maribor, Slovenia, June 2001, pp. 169-176.



Branko-Matjaž Jurič, “Business objects performance in J2EE,” a talk at the Wrox professional JAVA developer conference, Nehru Centre, Mumbai, India, March 1–3, 2001.

Branko-Matjaž Jurič, “Reusing legacy applications in modern e-commerce solutions,” a talk at the Wrox professional JAVA developer conference, Nehru Centre, Mumbai, India, March 1–3, 2001.

Vili Podgorelec, “Phisically Based Software Metrics,“ presentation in the framework of bilateral project SQUAB-I, Udine, Italy, March 2001.

Ivan Rozman, “VENDAR,“ invited speech at the Telekomunikacije 2001 conference, Nova Gorica, Slovenia, Sept. 21, 2001.


Dr. Vili Podgorelec: Program committee member, International Conference on Information Science Innovations ISI 2001, Dubai, UAE, March 2001.

Prof. Dr. Ivan Rozman: Program committee member, “Dnevi slovenske informatike DSI 2001”, Portorož, Slovenia, April 18–21, 2001.

Prof. Dr. Ivan Rozman, Asst. Prof. Dr. Marjan Heričko, Asst. Prof. Dr. Matjaž Branko Jurič, Aleš Živkovič, MSc, Dr. Tomaž Domajnko, Simon Beloglavec, Miha Strehar, Boštjan Šumak, Igor Novak:

Program committee and organizing committee members, The 6th Conference “Objektna tehnologija v Sloveniji OTS 2001”, Maribor, Slovenia, June 20–21, 2001.

Dr. Vili Podgorelec: Inviited section organizer and co-chair, World Multiconference on Systemics, Cybernetics and Informatics SCI 2001, Orlando, USA, July 2001.

Asst. Prof. Dr. Matjaž Branko Jurič: Program committee member, Multiconference on Systemics, Cybernetics and Informatics SCI 2001, Orlando, USA, July 2001.


Prof. Dr. Ivan Rozman: Program committee member, The 11th International Conference “Information and Intelligent Systems IIS 2001”, Varaždin, Croatia, Sept. 26–29, 2001.

Prof. Dr. Ivan Rozman, Asst. Prof. Dr. Romana Vajde Horvat, Regina Stajnko:

Organizing committee members, TEAMWORK workshop, Maribor, Slovenia, Oct. 15-16, 2001.

Prof. Dr. Ivan Rozman: Program committee member, International Multiconference “Informacijska družba IS 2001”, Ljubljana, Slovenia, Oct. 22–26, 2001.

Prof. Dr. Ivan Rozman, Asst. Prof. Dr. Marjan Heričko:

Program committee member, Seminar INFOS 2001, Ljubljana, Slovenia, Oct. 22–26, 2001.

Prof. Dr. Ivan Rozman: Chair of blue line “Razvojni izzivi e-ekonomije”, Seminar INFOS 2001, Ljubljana, Slovenia, Oct. 22–26, 2001.

Asst. Prof. Dr. Romana Vajde Horvat:

Program committee chair and organizing committee member, The 4th Regional Consultation “Dan kakovosti v Podravju; kakovost – integracija sistemov vodenja”, Maribor, Oct. 23, 2001.

Dr. Vili Podgorelec: Invited session organizer and co-chair, IEEE Conference on Systems, Man and Cybernetics SMC 2001, Tuscon, USA, Oct. 2001.

Prof. Dr. Ivan Rozman: Chair of National Committee for Higher Education of Slovenia and Committee for Higher Education of University of Maribor, Slovenia.

Asst. Prof. Dr. Marjan Heričko: Member of the State Subject Commission for Computer Science.

Prof. Dr. Ivan Rozman, Asst. Prof. Dr. Matjaž Branko Jurič:

Guest editors of the journal Informatica, Slovenian Informatics Society.


Asst. Prof. Dr. Matjaž Branko Jurič: Book reviewer, John Wiley & Sons. Publishers.

Asst. Prof. Dr. Matjaž Branko Jurič: Reviewer for Information and Software Technology Journal, Elsevier Science.


Technical committee member, ISO 176/SC2.


Technical committee chair, “Vodenje in zagotavljanje kakovosti”, Slovenian Institute for Standardisation.


Vice-Chair of the Quality Board, Chamber of Commerce of Slovenia – Maribor Regional Department, Slovenia.

Davor Bonačić, MSc: Editorial board member of the journal Win.Ini.

Dr. Vili Podgorelec: Guest editor, Journal of Medical Systems, Kluwer Academic/Plenum Publishers.

Dr. Vili Podgorelec: Referee for Information Processing Letters, Elsevier Science.


Aleš Živkovič, Msc: Brandenburg Technical University Cottbus, Germany, Feb. 2001.

Dr. Vili Podgorelec: Project SQUAB-I, University of Udine, Mathematics and Informatics Department, Udine, Italy, March 5–9, 2001.

Dr. Vili Podgorelec: Project SQUAB-A, cooperation with General Electric, Chicago, San Francisco, USA, April 5–11, 2001.

Prof. Dr. Ivan Rozman: ENQA – European Network for Quality Assurance in Higher Education, Brussels, Belgium, May 22–23, 2001.


Dr. Vili Podgorelec: Project INMES, Charles University Prague, Prague, Czech Republic, June 2–5, 2001.

Prof. Dr. Ivan Rozman, Asst. Prof. Dr. Romana Vajde Horvat:

Workshop in the scope of the 5th framework program TEAMWORK, TecNet, Ireland, July 13–16, 2001.

Asst. Prof. Dr. Matjaž Branko Jurič: WROX Press, Birmingham, Great Britain, July to Sept. 2001.

Prof. Dr. Ivan Rozman: Meeting of the representatives of the national and university committees for higher education, Krakow, Poland, Oct. 11–14, 2001.

GUESTS AND VISITORS

Dwight Deugo (Editor of Java Report, USA):

Invited lecture at the Conference OTS 2001, June 20–21, 2001.

Brian Foley (TecNet, Ireland):

Revision of the cooperation possibilities between Irish and Slovenian research institutes.


Dr. Vili Podgorelec, SIAM Student award, First SIAM International Conference on Data Mining SDM '01, Chicago, USA, April 2001.

Aleš Živkovič, BSc, IBM Certificate for Object-Oriented Analysis and Design with UML, Avg. 13, 2001.

Dr. Vili Podgorelec, Award for the Best PhD Article, The 10th Electrical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001.

IN – 22 Database Technologies Laboratory

DATABASE TECHNOLOGIES LABORATORY

Head:

Assoc. Prof. Dr. Tatjana Welzer Družovec

Phone: +386 2 235 51 30


RESEARCH PROJECTS


Applied project


Leader: Prof. Dr. Ivan Rozman Participants: Assoc. Prof. Dr. József Györkös; Prof. Emeritus Dr. Bruno Stiglic;


Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, RRC - Računalniške storitve, Zavarovalnica Maribor, GENIS d.o.o., Slovenian Government Centre for Informatics

The goal of this research project is the development of a methodology for the formal definition and continuous improvement of the software process. This developed methodology, together with the knowledge and experience gained in quality systems establishment, will be used for the development of an integral environment, which will support software process implementation. Together with the development of an integrated tool, we are also studying the usage of modern object-oriented tools and techniques, object databases, and distributed processing.

Database Technologies Laboratory IN – 23

Industrial project

Metodologija enotnega vzpostavljanja sistemov vodenja kakovosti v informacijski družbi (Methodology for Unified Quality Management System Establishment in Information Society)

Participants: Assist. Prof. Dr. Romana Vajde Horvat, Prof. Dr. Ivan Rozman, Katja Harej, Tomislav Rozman, Gregor Polančič, Boštjan Brumen, Boris Lahovnik, Davor Bonačić

Financed by: Ministry of Education, Science and Sports, and Ministry of Information Society of the Republic of Slovenia

This project is financed within the Slovenian program “Competitive position of Slovenia in 2001-2006”.







TEAMWORK IST-2000-28162

Technology Exploatation and Adaptable Methodologies offering new Organisational Models and Practices for e-Working Teams

Participants: Prof. Dr. Ivan Rozman, Asst. Prof. Dr. Romana Vajde Horvat, Assoc. Prof. Dr. Tatjana Welzer Družovec, Gregor Polančič, Tomislav Rozman, Regina Stajnko, Boštjan Brumen, Katja Harej

Financed by: European Union, 5th Framework Project

The main goal of the project is to verify and disseminate the BestregIT methodology (developed within previous EU projects and aims to model the organization’s mission, structure and process workflow) and NQA environment (which enables the automatization of workflow and document management). Both, BestregIT and NQA, have been introduced to members of the project team. Within the second part of the project, University of Maribor


team modelled the Socrates Erasmus student exchange process. Further, the model will be supported within NQA and verified and used within a test group of users. Other process models for cooperation of different partners within EU projects and for the cooperation of research institutions will be developed, as well as model for software development support. The results of the project will be disseminated within the broader community. There are 14 partners working within the project. The budget of the project is 1.2 million euro.

Valeurtech Highlighting Professional Experience in Europe in Undergraduate Curricula

Head: Jacques Fleck Participants: Assoc. Prof. Dr. Tatjana Welzer Družovec, Boštjan Brumen, Regina

Stajnko

Financed by: European Union, SOCRATES-LEONARDO Program Project

Participants in this project have a task to coordinate Slovenian partners in their execution of the student's industrial placements abroad program. Within the project, first of all a survey will be developed and carried out. Then, the survey will cover the involved enterprises. The Internet Web page will be developed, containing all the data for the partners involved as well as for the coordinator's needs.

The survey's results will be analyses. Based on the survey's results, the criteria for the evaluation of the students' results and progress through industrial placements and for the international recognition will be developed.

Sistemi integracije inteligence v zdravstveno okolje (Intelligent Systems Integration in Medical Environment)

Leaders: Assoc. Prof. Dr. Tatjana Welzer Družovec, Prof. Dr. Lorenzo Moreno Ruiz

Participants: Assoc. Prof. Dr. Peter Kokol, Asst. Prof. Dr. Marjan Družovec, Prof. Emerit. Dr. Bruno Stiglic, Boštjan Brumen, Dr. Špela Hleb Babič, Asst. Prof. Dr. Milan Zorman, Dr. Vili Podgorelec

Partner: Centro Superior de Informatica Universidad de La Laguna - Tenerife

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, Ministry of Foreign Affairs of the Kingdom of Spain

Firstly a simulation of the hospital management will be performed together with our partners within the scope of this project. A database, containing all necessary data about administration, hospital resources, schedules, personnel, etc. will serve as a basis for the program. The second part of the project represents a classification system for patients with Alzheimers disease, based on the EEG signals. The analysis will be performed by symbolical


representation of EEG signals with fuzzy automata, statistical classification and neural networks.

Industrial project

Izvedba analize zahtev za podatkovno bazo SIST (Requirements Analysis for SIST Database)

Participants: Prof. Dr. Ivan Rozman, Asst. Prof. Dr. Romana Vajde Horvat, Gregor Polančič, Tomislav Rozman, Katja Harej, Assoc. Prof. Dr. Tatjana Welzer Družovec, Štefan Masič

Financed by: Slovenian Institute for Standardization

The two main goals of the project are: • requirements analysis for an information system which would support the

standardization processes of SIST, and • review of the applicability of different DBMS according to the specifics of

standardization processes.

The project will be conducted in following phases: Phase 1: Analysis of standardization processes within SIST, based on a review of the current state and use of the information technology support. Phase 2: The developmet of a conceptual model of SIST database and description of required functionality of the information system to support standardization processes. Phase 3: Analysis of the applicability of commercial DBMS (Oracle and LotusNotes environment).

Results of the project will be: a conceptual model of SIST database and report of the DBMS analysis.


Applied project

PISUM Prenova informacijskega sistema Univerze v Mariboru (Renovation of Information System of the University of Maribor)

Leader: Assoc. Prof. Dr. Tatjana Welzer Družovec Participants: Štefan Masič, Izidor Golob, Boštjan Brumen


Financed by: University of Maribor, Slovenia Duration: 1999 – 2001

This project for renovation of the Information System (IS) of University of Maribor included an improvement of its academic, financial, and human resources sub-components.

The first part of the project included the following activities: • a preparation of legacy system review • a preparation of a strategic plan for the main organizational and functional areas and a

data scheme for the entire IS • preparation of all methodological documents needed (software requirements

specification documentation, review of information engineering methodology, review of conceptual design of databases and modelling environment, and standardization of the modelling environment) and the introduction of the project group.

The second part included practical activities resulting from the analysis and the preparation of functional specifications that will be a basis for the project leader’s decision when estimating the costs and determining project priorities and aid software designers when planning, implementing, testing, delivering, and documenting the process. We prepared the required methodological documentation and produced functional specifications and the data and functional models for the human resources part of the IS. We also managed communication among human resources department leaders who represented the end users of the human resources IS.


INMES Inteligentni sistemi v medicini (Intelligent Medical Systems)

Co-ordinators: Assoc. Prof. Dr. Peter Kokol, Prof. Dr. Lenka Lhotska Participants: Assoc. Prof. Dr. Tatjana Welzer Družovec, Asst. Prof. Dr. Milan

Zorman, Dr. Vili Podgorelec, Dr. Špela Hleb Babič, Matej Šprogar Project partners: Czech Technical University of Prague


In order to design successful intelligent systems for use in medical applications, we designed them with an appropriate design methodology. Therein lies another weakness – very few, if any, such methods exist in the world. Therefore the goals of our research were to develop successful design methods, to use these methods in designing real-world intelligent medical systems that are also based on hybrid approaches, and to use these systems in a manner that “invents” new medical knowledge in selected medical fields.


Industrial projects

Podatkovno skladišče (Data Warehouse)

Participants: Izidor Golob, Assoc. Prof. Dr. Tatjana Welzer Družovec Družovec, Boštjan Brumen, Štefan Masič

Financed by: InfoNet Kranj d.o.o., Slovenia Duration: 2000 – 2001

We were involved in a data warehousing project for Infonet Kranj Ltd., one of the leading Slovenian companies in the area of medical and pharmacy information systems. Over 5000 people, in hospitals and pharmacies in Slovenia and abroad, are now using the company’s computer applications. Recent introduction of a health-care insurance card in Slovenia has increased the importance of software capable of analysing administrative and medical data.

The operational database has been built according to the European medical standard HISA (Healthcare Information System Architecture), which is limited to the identification of a set of common services capable of supporting those parts of the information system related to the treatment of the subjects in care. The core of our cooperation is a transformation of the production database into a dimensional model that enables some vital analyses to be done faster and smoother, including analysis of data in healthcare record systems, relevant and common to the whole healthcare organization.

The laboratory provides education, cooperates in analysis, design and specification phases of the data warehouse, and in the technical infrastructure implementation phase.

Priprava izgradnje središčne podatkovne baze Viator&Vektor (Preparation for Central Database Development for Viator&Vektor)

Participants: Štefan Masič, Assoc. Prof. Dr. Tatjana Welzer Družovec, Izidor Golob, Boštjan Brumen

Duration: 2000 – 2001

A project for the preparation for development and implementation of a central database system was conducted in a co-operative framework with the Viator&Vektor company. This system was planned to include all present and future activities of the company. This project included an analysis of the key business areas and requirements of the whole information system. The complexity of a database, DBMS and corresponding application systems were estimated. A proposal was made regarding the appropriate software and hardware platform for data and other company servers was given. This proposal included a study of the appropriate software development tools to be used.


PUBLICATIONS

Marjan Družovec, Tatjana Welzer Družovec, Matjaž Colnarič, József Györkös, “Diagnostics and a qualitative model,” International journal of medical informatics, Vol. 63, pp. 51-60, 2001.

Tatjana Welzer Družovec, Ivan Rozman, Marjan Družovec, Romana Vajde Horvat, Iztok Takač, Boštjan Brumen, “Database reusability in intelligent medical systems,” J. med. syst., Vol. 25, No. 2, pp. 83-93, 2001.

Romana Vajde Horvat, Tatjana Welzer Družovec, Ivan Rozman, Mirko Soković, “Ocenjevanje zahtevnosti postopkov,” Stroj. vestn., Vol. 47, No. 1, pp. 15-27, 2001.

Boštjan Brumen, Tatjana Welzer Družovec, Romana Vajde-Horvat, Ivan Rozman, “Varovanje podatkov v računalniških sistemih,” Kakovost, No. 3, pp. 20-23, 2001.

Marjan Družovec, Tatjana Welzer Družovec, Andrej Godina, “Quality control in manufacturing processes for new products,” Contemporary research issues in new product introduction, Vaasa, Vol. 77, pp. 67-79.

Boštjan Brumen, Tatjana Welzer Družovec, Izidor Golob, Hannu Jaakkola, “Black-box approach to assessment of performance of classification models,” International ICSC congress on Computational intelligence CIMA 2001, Bangor, Great Britain, June 2001, 6 pp.

Tatjana Welzer Družovec, Boštjan Brumen, Izidor Golob, Ivan Rozman, “Data mining - an overview,” International ICSC congress on Computational intelligence CIMA 2001, Bangor, Great Britain, June 2001, 5 pp.

Boštjan Brumen, Izidor Golob, Tatjana Welzer Družovec, Hannu Jaakkola, “Data mining and database size - how large is large?” The IASTED International Symposia Applied Informatics, Innsbruck, Austria, Feb. 2001, pp. 714-718.

Boštjan Brumen, Tatjana Welzer, Izidor Golob, Hannu Jaakkola, “Convergence detection in classification task of knowledge discovery process,” Portland international conference on management of engineering and technology PICMET '01, Portland, USA, July 2001, Vol. 1, pp. 66.

Boštjan Brumen, Tatjana Welzer, Izidor Golob, Hannu Jaakkola, “Convergence detection in classification task of knowledge discovery process,” Portland international conference on management of engineering and technology PICMET '01, Portland, USA, July 2001, Vol. 2, 8 pp.



Tatjana Welzer, Izidor Golob, Marjan Družovec, Smiljana Slavec, Boštjan Brumen, Iztok Takač, “Data quality in clinical information systems,” The International NAISO Congress on Information Science Innovation ISI 2001, Dubai, United Arab Emirats, Mar. 2001, pp. 1-5.

Franjo Maystor, Tatjana Welzer-Družovec, “IPsec extensions for remote access VPNs,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 87-90.

Izidor Golob, Tatjana Welzer-Družovec, Boštjan Brumen, “Najpogostejše napake pri gradnji podatkovnih skladišč,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 111-114.

Izidor Golob, Tatjana Welzer Družovec, “Arhitekture podatkovnih skladišč,” Dnevi slovenske informatike, Portorož, Slovenia, Apr. 2001, pp. 108-116.

Boštjan Brumen, Tatjana Welzer-Družovec, Hannu Jaakkola, Izidor Golob, “Adaptive incremental approach to construction of classification models,” 11th European-Japanese Conference on Information Modelling and Knowledge Bases, Maribor, Slovenia, May 2001, pp. 289-294.

Tatjana Welzer-Družovec, “Domain knowledge and experiences in conceptual modeling,” 11th European-Japanese Conference on Information Modelling and Knowledge Bases, Maribor, Slovenia, May 2001, pp. 415-416.


Tatjana Welzer, Izidor Golob, Marjan Družovec, Smiljana Slavec, Boštjan Brumen, Iztok Takač, “Data Quality in Clinical Information Systems,” invited speech at the International ICSC Congress on INFORMATION SCIENCE INNOVATIONS ISI 2001, Dubai, United Arab Emirats, March 17–21, 2001.

Boštjan Brumen, “Advanced Data Security,” lecture at the Tampere University of Technology, Information Technology, Pori, Finland, April 17–30, 2001.

Tatjana Welzer Družovec, “Introduction to Data Security,” lecture at the Tampere University of Technology, Information Technology, Pori, Finland, April 19–30, 2001.


Tatjana Welzer Družovec, “Data on the Web,” lecture at the Vaasa University, Finland, April 19–30, 2001.

Tatjana Welzer Družovec, “Data in Intelligent Systems,” lecture at the University of La Laguna, Spain, May 10–17, 2001.

Boštjan Brumen, Tatjana Welzer, Hannu Jaakkola, Izidor Golob, “Black-box Approach to Assessment of Performance of Classification Models,” invited speech at CIMA 2001, Bangor, Great Britain, June 19–22, 2001.

Tatjana Welzer, Boštjan Brumen, Izidor Golob, Ivan Rozman, “Data Mining – an Overview,” invited speech at CIMA 2001, Bangor, Great Britain, June 19–22, .2001.

Tatjana Welzer Družovec, Marjan Družovec, “Similarity Search of Reusable Database Components Using Data Mining Techniques,” invited speech at the 13th International conference on systems research, informatics and cybernetics InterSymp 2001, Baden-Baden, Germany, July 30 till Aug. 4, 2001.

Boštjan Brumen, Tatjana Welzer, Hannu Jaakkola, Izidor Golob, “Sample-Based Performance Assessment of Learning Algorithms,” invited speech at the 13th International conference on systems research, informatics and cybernetics InterSymp 2001, Baden-Baden, Germany, July 30 till Aug. 4, 2001.

Tatjana Welzer Družovec, “Data Reusability,” lecture at the University of Madeira, Funchal, Portugal, Nov. 12–16, 2001.

Tatjana Welzer Družovec, “Security in Computer Environment,” lecture at the University of Madeira, Funchal, Portugal, Nov. 12–16, 2001.


Assoc. Prof. Dr. Tatjana Welzer Družovec:

Special Edition Guest Editor at ISI 2001 - International ICSC Congress on Information Science Innovations, Dubai, UAE, March 2001.


Special Edition Guest Editor of Journal of Medical Systems, Vol. 25, No. 2, April 2001.


Organizer of the SOCRATES coordinator meeting, Maribor, Slovenia, April 2001.



Member of the Steering Committee of ISM 2001 - International Conference on Information Systems Modelling, Hradec nad Moravici, Czech Republic, May 9–11, 2001.

Assoc. Prof. Dr. Tatjana Welzer Družovec, Prof. Dr. Ivan Rozman:

Co-chair of Program Committee and Conference Chair at EJC 2001 - 11th European-Japanese Conference on Information Modelling And Knowledge Bases, Maribor, Slovenia, May 29 to June 1, 2001.


Special Edition Guest Editor of Journal of Medical Systems, Vol. 25, No. 3, June 2001.


Special Edition Guest Editor of CIMA 2001 - Computational Intelligence: Methods & Applications, Bangor, Great Britain, June 2001.


Member of the Steering Committee of ReTIS 2001 - 7th ReTIS International Conference on Reengineering Technologies for Information Systems, Lyon, France, July 4–6, 2001.


Member of the Program Committee of SCI 2001 - 5th World Multiconference on Systemics, Cybernetics and Informatics, Orlando, USA , July 22–25, 2001.


Member of the Program Committee of MEDINFO 2001 - Tenth World Congress on Health and Medical Informatics, London, Great Britain, Sept. 2–5, 2001.


Member of Program and Steering Committee ADBIS 2001 – Advances in Databases and Information Systems, Maribor, Slovenia, Sept. 2001.



Assoc. Prof. Dr. Tatjana Welzer Družovec, Boštjan Brumen:

A visit within “teachnig staff mobility” program, SOCRATES-ERASMUS, Tampere University of Technology, Pori School of Technology and Economics, Pori, Finland, Aprill 19–30, 2001.


A visit within “teachnig staff mobility” program, SOCRATES-ERASMUS, University of Vaasa, Vaasa, Finland, April 19–30, 2001.


A visit within “teachnig staff mobility” program, SOCRATES-ERASMUS, University of La Laguna, Spain, May 10–17, 2001.


A visit within “teachnig staff mobility” program, SOCRATES-ERASMUS, University of Madeira, Funchal, Portugal, Nov. 12–16, 2001.

GUESTS AND VISITORS

Hannu Jaakkola, Timo Varkoi (Tampere University of Technology, Pori School of Technology and Economics, Pori, Finland):

A visit within “teachnig staff mobility” program, SOCRATES-ERASMUS, Jan. 3–8, 2001.

Hannu Jaakkola (Tampere University of Technology, Pori School of Technology and Economics, Pori, Finland):

A working visit, March 1– 4, .2001.

Filipe Monteiro (University of Minho, Braga, Portugal):

A visit within “student mobility” program, SOCRATES-ERASMUS, April to July 2001.

Kimmo Salmenjoki (University of Vaasa, Vaasa, Finland):

A visit within “teachnig staff mobility” program, SOCRATES-ERASMUS, May 23 to June 1, 2001.


Hannu Jaakkola (Tampere University of Technology, Pori School of Technology and Economics, Pori, Finland):

A working visit, May 25 to June 2, 2001.

Jose Luis Sanchez (University of La Laguna, Spain):

A visit within “teachnig staff mobility” program, SOCRATES-ERASMUS, June 23–29, 2001.


Assoc. Prof. Dr. Tatjana Welzer Družovec, IIAS 2001 Meritorious Award.

Boštjan Brumen, IIAS Award in Scholarly Research in Recognition of High Quality innovative Research Work.

Assoc. Prof. Dr. Tatjana Welzer Družovec, IGIP Title of European Engineering Educator, ING-PAED IGIP.

Boštjan Brumen, IGIP Title of European Engineering Educator, ING-PAED IGIP.

Assoc. Prof. Dr. Tatjana Welzer Družovec, Day of Faculty Award in Recognition of Influential Talks and Contributions at International Conferences.

IN – 34 Computer Mediated Communication Laboratory

COMPUTER MEDIATED COMMUNICATION LABORATORY

Head:

Assoc. Prof. Dr. József Györkös

Phone: +386 2 235 51 25


RESEARCH PROJECTS


Applied project


Leader: Prof. Dr. Ivan Rozman Participants: Assoc. Prof. Dr. József Györkös; Prof. Emerit. Dr. Bruno Stiglic;


Financed by: Ministry of Science and Technology for the Republic of Slovenia, RRC–Računalniške storitve, Zavarovalnica Maribor, GENIS d.o.o., Slovenian Government Centre for Informatics

The goal of this research project is the development of a methodology for the formal definition and continuous improvement of the software process. The developed methodology, together with the knowledge and experience gained in quality systems establishment, will be used for the development of an integral environment, which will support software process implementation. Together with the development of an integrated tool, we are also studying the usage of modern object-oriented tools and techniques, object databases, and distributed processing.

Computer Mediated Communication Laboratory IN – 35


Metodologija enotnega vzpostavljanja sistemov vodenja kaovosti v informacijski družbi (Methodology for unified Quality Management System establishment in information society)

Participants: Asst. Prof. Dr. Romana Vajde Horvat, Prof. Dr. Ivan Rozman, Katja Harej, Tomislav Rozman, Gregor Polančič, Boštjan Brumen, Boris Lahovnik, Davor Bonačić

Financed by: Ministry of education, science and sports of Republic of Slovenia and Ministry of information society of Republic of Slovenia

The project is financed within Slovenian program “Competitive position of Slovenia in 2001-2006”.






Industrial projects

Tehnološka prenova sistema COBISS (Technological Reengineering of COBISS System)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Marjan Heričko; Assoc. Prof. Dr. József Györkös; Asst. Prof. Dr. Branko Matjaž Jurič; Asst. Prof. Dr. Romana Vajde Horvat; Aleš Živkovič, MSc; Simon Beloglavec; Miha Strehar; Boštjan Šumak; Igor Novak

Financed by: IZUM, Maribor, Slovenia

Institute of Informatics is organizing education and qualifications for development teams from IZUM. The goal of these activities is to widen their knowledge of object technology. In the project, the contents related to information system development in Java, distributed object architectures, unified modelling language UML, and object process models, are treated. The


other important goal of collaboration is definition of standard procedures for object development, with emphasis on reuse on higher levels of abstraction. Related to this, patterns for software development are introduced.

Šola informatike (Slovenian Information Technology School)

Participants: Prof. Dr. Ivan Rozman; Assoc. Prof. Dr. József Györkös; Asst. Prof. Dr. Marjan Heričko; Asst. Prof. Dr. Branko Matjaž Jurič; Asst. Prof. Dr. Romana Vajde Horvat; Aleš Živkovič, MSc; Irena Žerko - SRC d.o.o.

Financed by: SRC d.o.o., Slovenia

The SRC d.d. Company established the Slovenian Information Technology School (SITS) in 1997, the aim of which is to educate about information technology related issues. The Laboratory of Information Systems cooperates with this school in two subjects “Quality in Information Technology” and “Object Technology”. Seminars and workshops are held within SITS. SRC d.d. organizes activities and the Laboratory of Information Systems is responsible for the content of the educational activities.


Industrial projects

Uveljavljanje sistemov kakovosti v naročniško/dobaviteljskih odnosih na področju informacijskih sistemov (Establishment of Quality Systems in Customer/Supplier Relationships for Information Technology)

Participants: Assoc. Prof. Dr. József Györkös, Vesna Lešnik, Boris Lahovnik, Robert Leskovar, Andrej Bregar, Goran Papić, Barbara Wohinz (CVI)

Financed by: Government Center for Informatics, Republic of Slovenia Duration: 1997 – 2001

Within the scope of this project three main goals have been achieved. The first was the establishment of a Quality System (QS) for Informatics at the Slovenian Government Centre. The framework of this QS was set up in August 1997. It was then integrated with the Project Management Methodology in Slovenian Government Offices. In December 1999 the QS was ready for the certification process by an authorized certification agency, which issued the ISO 9001 certificate next year (with a consideration of ISO 9000-3 and ISO 9004-2). In the year 2001, after receiving the certificate, the first internal QS assessment of the whole QS was accomplished. Directives for upgrading the QS to the newest version of ISO 9001 and for


integration of certain QS processes were set up.

The second goal was an assessment of a Quality System of IT Service Suppliers. The suppliers of IT services for the Slovenian government are qualified according to the PROCESSUS assessment model. The third goal was an assessment of software/IT services provided by suppliers. The product assessment methodology and PRO+ (the SW Product Assessment Tool) were developed for this purpose, and they are already in use in Government Centre for Informatics.

Presoja projektov GURS - Geodetska uprava Republike Slovenije (Audit of the Projects of the GURS)

Participants: Assoc. Prof. Dr. József Györkös; Dr. Borut Žalik; Robert Leskovar; Boris Lahovnik; Peter Fajfar, MSc (CVI)

Financed by: Ministry of the Environment and Spatial Planning of the Republic of Slovenia

Duration: 2000 – 2001

(1) An estimation of a project: “A consultation to the prototype establishment of a central database of buildings and making the prototype of a program solution” from the viewpoint of quality assurance.

(2) An estimation of the project: A completion of software solutions at the Surveying and Mapping Authority of Republic of Slovenia in the connection with a Law about special conditions for registration of a private ownership on individual parts of building in the land cadastre.

Novi standardi ISO 9000:2000 v Sloveniji (New Standards ISO 9000:2000 in Slovenia)

Participants: Asst. Prof. Dr. Romana Vajde Horvat; Prof. Dr. Ivan Rozman; Vesna Lešnik, MSc; Tomi Rozman

Financed by: CCIS, participants of seminars/workshops Duration: 1999 – 2001

Within this project, several seminars and workshops on ISO 9000:2000 topics were conducted in cooperation with the Metrology and Standardization Institute of Slovenia and the Chamber of Commerce and Industry of Slovenia. The content of the seminars and workshops discussed the international and local development of new family ISO 9000:2000 standards. Requirements for new standards were also presented in detail. As the second goal of the project, the validation of new standards was conducted in some Slovenian companies.


Izgradnje informacijskih sistemov v državnih organih CVI-FERI-EMRIS (Information Systems Development in State Agencies)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Marjan Heričko; Assoc. Prof. Dr. József Györkös; Asst. Prof. Dr. Branko Matjaž Jurič; Asst. Prof. Dr. Romana Vajde Horvat; Dr. Tomaž Domajnko; Aleš Živkovič, MSc; Boris Lahovnik; Simon Beloglavec; Robert Leskovar; Miha Strehar; Boštjan Šumak; Igor Novak

Financed by: Center Vlade RS za informatiko (CVI) Duration: 2000 – 2001

The goal of the project was advising on, and the development of a unified method for object based information system development with the emphasis on modern accessions, cooperation by the development of other volumes of the unified methodology, and the development of an assessment method for the determination of the size and the cost of software projects.

Vzpostavitev sistema kakovosti za področje informatike s standardnimi postopki (Quality Assurance System for Informatics with Standard Procedures)

Participants: Prof. Dr. Ivan Rozman; Asst. Prof. Dr. Romana Vajde Horvat; Asst. Prof. Dr. Marjan Heričko; Vesna Lešnik, MSc; Tomi Rozman; Gregor Polančič; Katja Harej


The project was aimed to define and re-engineer the software development process in Information technology sector of Telekom Slovenia. Within the project the seminars and workshops for software process improvement areas were conducted. Representatives of Telekom were trained to conduct the SPI and quality management system activities within their Sector of information technology. The contents of 20 processes were defined. The project was conducted according to PROCESSUS® methodology, which was developed by the Laboratory of information technology.

PUBLICATIONS


József Györkös, Robert t. Leskovar, “Intelligent user-centered information management in tourism Web portals,” Informatologia, Vol. 34, No. 1-2, pp. 78-80, 2001.


Marin Silič, Marko Colnar, Marjan Krisper, József Györkös, Marko Ambrož, Aleksander Bucik, Aleš Dobnikar, Boris Butina, Aleksander Boh, Nika Rebernik, Marko Črnigoj, Tatjana Hajtnik, Ivan Bohanec, Saša Bole, Pavla Lah, Dušan Šalehar, Barbara Wohinz, Ivan Rozman, Vladislav Rajkovič, Janez Bešter, Franc Solina, Blaž Zupan, Aleksander Novaković (ed.), Roman Tomažič (ed.), E-poslovanje v javni upravi RS za obdobje od leta 2001 do leta 2004. Ljubljana, Slovenia: Center Vlade za informatiko 2001.

Robert T. Leskovar, József Györkös, “Autonomous workgroup memory establishment,” Portland international conference on management of engineering and technology PICMET '01, Portland, USA, July 2001, Vol. 2, 5 pp.

Robert T. Leskovar, József Györkös, “Autonomous workgroup memory establishment,” Portland international conference on management of engineering and technology PICMET '01, Portland, USA, July 2001, Vol. 1, pp. 435.


Andrej Bregar, “Aplikacija nevronskih mrež v sistemih za podporo odločanju,” 10th Electrotechnical and Computer Science Conference ERK 2001, Portorož, Slovenia, Sept. 2001, Vol. B, pp. 209-212.

Robert T. Leskovar, “Prehod od upravljanja dokumentacije k obvladovanju informacij,” 4. regionalni posvet “Dan kakovosti v Podravju”, Maribor, Slovenia, Oct. 2001, pp. 27-34.


Boris Lahovnik: Organisation of “Šesto strokovno srečanje OTS 2001”, Maribor, Slovenia, June 20–21, 2001.

IN – 40 Real-Time Systems Laboratory

REAL-TIME SYSTEMS LABORATORY

Head:

Assoc. Prof. Dr. Matjaž Colnarič

Phone: +386 2 220 74 30


RESEARCH PROJECTS



Z2-3493-0796 Holistic Embedded Control Systems Design

Leader: Dr. Roman Gumzej


In the project, methods for holistic embedded control systems hardware and software design will be devised and joined in a methodology, with the goal of enhancing their reliability, safety and maintainability. Areas of hardware and software architecture (co-)specification, verification and validation of the design with regard to its feasibility will be covered. An existing real-time programming language will be enhanced for use with the mentioned methodology. Tool prototypes will be implemented to check the suitability of these novel concepts.

This project outlines an approach to co-design of hardware and software which has the goal of achieving a better quality of real-time systems. The syntax was defined for a specific meta-language to describe the hardware and software configuration of the system. The standard PEARL for distributed systems (DIN 66253, Part 3 [PEARL89]) is considered the basis for our research. It defines the syntax of the hardware and software configuration description language, which is meant to be used for systems that are programmed in PEARL [PEARL81, PEARL82]. The above mentioned specification language was enhanced to enable the specification of asymmetrical architecture and diverse multiprocessor systems' architecture as well as a precise description of peripheral devices, attached to them.

Graphical constructs with the same semantics as the formerly described syntax are defined and a tool, enabling specification and code production in the formerly mentioned syntax, is

Real-Time Systems Laboratory IN – 41

being developed. The possibility of using this tool as a development framework for producing the specification of hardware and software architectures (taking the visual CASE tools as an example) is being considered. It was extended with timed state transition diagrams to be able to build prototypes of applications. These diagrams have the semantics of timed state transition automatons. They contain the framework of the application as well as all its real-time constraints. The feasibility of the applications' architecture (program model) on the designed systems' architecture (the virtual machine) is to be checked by co-simulation.

Applied project

L2-3446-0796 Dependability of Embedded Control Systems

Leader: Dr. Domen Verber Participants: Aleksander Polutnik, MSc (Ultra d.o.o.); Bor Prihavec, MSc (Ultra

d.o.o.)

Financed by: Ministry of Education, Science and Sport of the Republic of Slovenia, Ultra d.o.o.

A typical control system today consists of physical process components, sensors, actuators, distributed computers with communication networks, and several thousands of lines of code. Examples of these are control systems in industrial plants, nuclear reactors, avionics, etc. The size and the complexity of such systems increases every year and so does the probability of fault in one of many components. Each fault in such a system can cause severe material loss or even endanger human lives. Most of the research dealing with the problem of fault-tolerant computing is only providing partial solutions. However, for appropriate consideration of all problems, the holistic approach is necessary. The main aim of the project is the study and development of methods and tools for hierarchically organised fault-tolerant control systems. Such systems consist of hierarchically an organised function unit. At the lowest level, they are connected with the network of sensors and actuators, through which the control system communicates with its environment. The proposed model can deal with faults in the environment, in the hardware and software of the embedded system, etc. Basic research topics covered by the project are fault detection, fault localisation and isolation, graceful degradation of the functionality of the system in a case of a minor fault, and control and safety shut-down of the system in the case of severe defects.

PUBLICATIONS


IN – 42 Real-Time Systems Laboratory


Matjaž Colnarič, Domen Verber, “Dealing with tasking overload in object oriented real-time applications design,” Sixth international workshop on object-oriented real-time dependable systems WORDS '01, Roma, Italy, Jan. 2001, pp. 226-232.

Vili Podgorelec, Peter Kokol, Milan Zorman, Matej Šprogar, M... Pighin, “The operative constraints of software reliability prediction methods,” World Multiconference on Systemics, Cybernetics and Informatics SCI 2001 and ISIS 2001, Orlando, USA, July 2001, Vol. 11, pp. 229-234.


Matej Šprogar, Peter Kokol, Milan Zorman, Vili Podgorelec, Lenka Lhotska, Jiøi Klema, “Notes on medical decision model creation,” Second international symposium ISMDA 2001, Madrid, Spain, Oct. 2001, pp. 270-275.

Matej Šprogar, Peter Kokol, Milan Zorman, Vili Podgorelec, Ryuichi Yamamoto, Gou Masuda, Nrihiro Sakamoto, “Supporting medical decision with vector decision trees,” 10th World Congress on Medical Informatics MEDINFO 2001, London, Great Britain, Sept. 2001, 5 pp.

Matjaž Colnarič, “Enhancing integrity of embedded control systems,” IFAC Conference on new technologies for computer control NTCC 2001, Hong Kong, Nov. 2001, pp. 566-571.


Roman Gumzej, Matjaž Colnarič, “An approach to modeling and verification of real-time systems,” Proceedings, pp. 283-290.

Roman Gumzej, Matjaž Colnarič, “HW/SW components for real-time systems co-design,” 23rd international conference on information technology interfaces ITI 2001, Pula, Croatia, June 2001, pp. 455-460.

Wolfgang A. Halang, Matjaž Colnarič, “Instruction pre-fetching and caching supported by intelligent memory,” Computers in technical systems and intelligent systems CBSE+CTS+CIS, Opatija, Croatia, May 2001, pp. 38-43.

Real-Time Systems Laboratory IN – 43

Domen Verber, “Objektni pristop in sistemi v realnem času,” Objektna tehnologija v Sloveniji OTS 2001, Maribor, Slovenia, June 2001, pp. 270-277.


Assoc. Prof. Dr. Matjaž Colnarič: Program committee member and reviewer at the International IFAC Workshop on Real-Time Programming WRTP, Hong Kong, Nov. 2001.

Assoc. Prof. Dr. Matjaž Colnarič: Vice-chair of technical committee for real-time software engineering at IFAC (annual meeting), Hong Kong, Nov. 2001.


Assoc. Prof. Dr. Matjaž Colnarič: Negotiations for the participation in existing EU projects, EU, Brussels, Belgium, Feb. 2001.

GUESTS AND VISITORS

Prof. Dr. Wolfgang Halang (Fernuniversität Hagen, Germany):

Visit to the Centre for distance education development, TEMPUS project, invited opening lecture for Real-time systems, Maribor, Slovenia, Oct. 2001.

Documents

UNIVERSITY OF MARIBOR...Buildings of the Faculties of Engineering of the University of Maribor ence in the front (a view from the west side) Faculty of Electrical Engineering and Computer